What's the best way to deter our cat from scratching at our bedroom door?

With my husband's allergies and our soon-to-be-arriving baby that we will be
cosleeping with, we made the decision a few weeks ago to keep the cats out
of the bedroom. We are extremely happy with the decision and we are both
breathing better at night (we are both slightly allergic to them). My
husband doesn't have to take extra allergy medicine anymore and his asthma
has improved. We did a thorough cleanup this past weekend and it is amazing
how much cat hair gets around our routine cleanings.

Unfortunately, our oldest cat Luna is not pleased with the decision at all.
He is a half-Maine Coon neutered male who just turned 4. He is definitely
the dominant cat, and I am "his". He is a very intelligent cat and
discipline has always been difficult with him. When he gets squirted with a
water bottle, he knows that we are doing it (as opposed to our younger
half-Siamese Mina who has an almost comical "where the heck did that come
from" reaction). He knows the meaning of the word "No" and the tone/gesture
for "Out", but being a typical cat, he will usually stall and sulk. He
basically has an "I don't care attitude" when we try and discipline him.

Early on, he had an obsession with clawing and meowing at the front door to
get out. As a kitten, we used to let him out for short, monitored
excursions since we've never lived anywhere where I've felt safe letting him
wander at will (we're now in the country but we live 100 feet from a heavily
traveled road and since we've lived here I've been unable to avoid hitting 2
cats and have dodged dozens more). After a while, though, he used those
excursions to try and run and hide in order to stay outside and they only
made the clawing and meowing worse, so we discontinued them, except for
every couple months or so. He rarely meows or scratches at an outside door
(it also helps we have an indoor porch between him and the outside now), but
we still have to be on guard for him rushing past us.

Well anyways, he has started a campaign of clawing and meowing at our
bedroom door once or multiple times during the night. We tried ignoring it,
but it made no difference to him, and after several days of interrupted
sleep, we found a yelled "NO" would usually suffice. That didn't last long.
We tried the squirt bottle, but within a few days of that, when he hears us
getting up to squirt him, he'll be all the way down the hall or hiding in
the bathroom (I know discipline doesn't count unless you catch them in the
act, so what if they know they're doing something wrong and run away from
the discipline - I'm really confused about this). We keep the bathroom
door closed now, which eliminated a place to hide, but that only worked a
few days. What we've been doing now, is that when he scratches the first
time, my husband will squirt him into the living room (if he isn't already
there) and close the door between the living room and hallway (he'll claw
and meow at that door too but we can only barely hear him thank goodness).
The only problem is that doing that isolates them from their litter box (and
we don't want the mess/hassle of setting up a second one in there), so we
can't do that too long. It also hasn't made any difference with his
scratching if the door comes open or my husband forgets to close it when he
leaves for work in the morning.

It drives me crazy that HE KNOWS that its driving us crazy. LOL I wasn't
always sure if it was the case, but I'm pretty sure that Luna is aiming for
any attention he can get from us, negative or not. When I open the door and
he's already down the hall, he's already won for all purposes of the
interaction. He's even started trying to run/sneak past us into the bedroom
or into the hallway door when we open them to discipline him, like he thinks
we won't do anything to him once he gets in there (yeah right). His
persistence is driving me crazy, but there is no way that I am reversing my
decision.

I'm at my wits end and sleeping right now is hard enough without the meowing
and scratching (I'm awake at the first scratch). Any suggestions? We've
pondered duct tape, which we've used with decent success in the closet where
their litter box is due to the very loud scratching/pounding he would do
after using the litter box. I think a Scat Mat would be perfect for this
purpose, but we honestly can't afford one right now (I've even checked
eBay). I've never used Feliway, but I've heard it discussed here. Would
that have a chance of working? Am I right in that Luna isn't being picky
over positive or negative attention? In that case, is there anything
differently behaviorally we could do? I'm very tired, very frustrated, but
committed to keeping the family together.

- Joanne