Please stop. His body will be ready when he's ready. Don't spend money on an alarm either, you'll only lose more sleep and it WILL cost you a lot more money if you change him several times through the night when that alarm goes off. I need my rest so I don't worry about them wetting. I care about them taking a shower in the morning so they don't smell like pee all day.
Obviously if you're having to wake him up to change him and his bed then hubby doesn't know what he's talking about. Seriously? He thinks he just needs to be wet to stop it? He's wet and it's not stopping him so how is hubby's comment even connected to what's actually going on?
IF you have a LOT of free time and a LOT of extra money to do laundry load after load every day then by all means, put him in underwear. BUT don't wake him up. That does nothing but make everyone lose sleep.
Keep him in pull ups until he's dry several weeks in a row. Then you can go to underwear but he's still going to have accidents. So keep a waterproof pad on his bed so his mattress won't stink.
The cost of pull ups is about $20 per month. That's one pull up per night and a couple more out of a new box. We pay about $15 for each box of overnight pulls ups at Walmart. We use that whole bag plus a few more from a new one. So 3 bags covers well over 2 months.
Adding 2-3 loads of bedding to your already full laundry chore is frustrating and it costs a lot more than that box/bag of pull ups.
You increase your electric bill for the water, the power to run the washer and dryer, the natural gas to run the dryer, the laundry supplies can double and that's a huge increase in cost. I add bleach to my loads to help sanitize them. Only about 1/4 of a cup though. It doesn't take much and that's only in a top loader machine. I use vinegar in my front loader.
So to keep costs down and your time freer you need to keep him in one pull up every night for the time being.
Also, have the doc do an x-ray of the kiddo's abdomen. I bet you're surprised at how much stuff is in there. In a lot of cases where the kids just don't stay dry at night they have a LOT of feces in their body. Taking one dose of that powder that stays clear in liquid really keeps the kids from getting blocked up.
When they are having issues we give it to them twice per day for 4 days then back it down to 1 time per day. They have to take it every day for now.
I have IBS with chronic diarrhea. The kids appear to have IBS but with chronic constipation. The weight of the feces push the pee out when kiddo relaxes and goes to sleep.
Make sure they are drinking enough, even in the evening. This will allow their bladder to completely fill and might start waking them up. It seems odd I know. BUT a dehydrated kid wets more than a kid who has plenty to drink.