I have sleeve dwellers too
It is OK to just hold the joey instead of leaving him in your sleeve where they left him. Take him out of your sleeve and start handling him. That is prime time to start socializing him getting him used to you, hands, your voice, being held, etc.
I used to worry that my hands were to hot and the joey would overheat. Warm hands are actually comforting to the joey, it resembles the warmth of moms pouch.
It will also help when he starts calling to mom n dad, they will find him faster if your able to show him to them quickly, instead of them having to look for him. It will cause less stress to everyone.
He will learn to go into your sleeve from mom n dad when his eyes open
When I had joeys here, when everrrrrrrrr I saw the joey not latched on to mom n dad I'd take them out to handle them for as long as they were not fussing, even during the day. If they cried I took them back to the cage where mom or dad promptly collected them. Start gradually and build up to keeping the joey a little longer at a time as he grows and matures.
This will make for one veryyyyy handle able glider who won't need "bonding" like his mom n dad did. To the joey you'll be an extension of the family/colony like a big brother or sister that babysits him.
All 3 of the joeys born here are mellow, amazing, I can handle them easily and do anything I need to to them,they stay on me and have never once tried to get off my body.
With one exception. I can't just hand them to anyone without them crabbing. The ONLY time these joeys crabbed was when I handed them to a friend to hold, once the joey realized it wasn't me they crabbed until I took them back lol. My boyfriend and I are not that social and don't have people over very often so none of my gliders are social with anyone else but us.
The parents never bickered with each other like that, but again the joey was always usually visible to them so they didn't stress. Even if they were in the cage and I had the joey in the bedroom, if the joey fussed we went right back to the cage.
Also take this opportunity to get pics of the joey as he grows. I alwaysssssss had the camera handy and ready when I had joeys out
The first joey is always a worry, with everything. It's normal. I was a nervous wreck with our first lol but the mom was experienced and taught me and the dad as we went. I also had the benefit of having a mentor that taught me as well.
The biggest thing I can tell you is to relax, and enjoy the experience. If your worried all the time so will the parents. When the joey fusses talk to it, tell the parents you have him, he's right here... and show him to them.
Cleaning the pouch is normal for the mom and if joey is in there Dad might stick his head in to clean the joey too.