I'm rooting for you as well and following for updates, bless you for doing what you can for him
I cared for a post op beardie, not amputee per say but it was a gastric operation rather. In terms of nursing your beardie after i can maybe give you some tips from my experience:
1. "Surgery proof" the enclosure before he comes home- even if just temporarily while he is recovering. Beardies naturally like to climb and flop around, my girl still tried to do this after her surgery as well. I took down anything she could fall too high off of. Every other ornament I covered with fabric or paper towels to pad/soften it so she wouldn't aggravate her surgery site on accident.
2. It's likely the vet will put your beardie on meds, pain meds for certain but also prophylactic antibiotic treatment could be likely. This means your beardie will need probiotics to balance those meds out, and regular poo checks to ensure there isnt any issues in the tummy after surgery (I think you can just drop the samples at your vet every 2 weeks for 1-2 months maybe). Tracies site sells probiotics but if you ask your vet they also may be able to decant you some they have on hand.
3. Give prescribed pain medication at set intervals each day to maintain a therapeutic balance and prevent breakthrough, which could otherwise cause distress. If its once a day, give it at the same time every day.
4. Create a "slurry" of oxbow critical care, some usual greens, water and some insects in a blender or food processor. You can make a large batch of it, and buy a rubber ice cube tray from Kmart to put the "portions" in and freeze it. You can then just thaw individual portions out by letting it sit in fridge few hours before use and mixing a little warm water. The remaining frozen portions should be good for up to one month. Your vet might not advise this as being needed and allowing normal foods as tolerated but surgery is a lot of stress so it's good to supplement them while recovering if he's off his food. Give slowly via syringe as tolerated
5.
Hydrate frequently by offering water on the snout via syringe. The meds will dehydrate him easily.
6. Increase the tank temp at night to ambient temp 80 degrees while recovering. If you do not have a CHE or even better: Deep Heat Projector (Arcadia) then definitely get one before he comes home and have on at night, set to a thermostat.
7. Gentle cuddles and TLC, for short periods a few times a day if he tolerates it. I found this perked my girl up a lot on her low days she would brighten and easily settle just after a little attention. Just make sure its warm enough.
8. Don't
bathe him, but you can take a dramp warm washcloth and give him a light "sponge" to
hydrate him as well, just try not to go over the affected areas and stick to the healthy areas.
If there is multiple meds given id also suggest spreading these out. (Ie. You might give the antibiotic in the morning then the pain medication at bedtime). This will also help to reduce stress on their tummy flora. You can give a little bit of feed with the meds so that it's a little easier for them to digest.
Sorry for the long post, i hope my experience can help you and your boy. my dms are open if you need to talk or need some more support. When i saw this post it broke my heart that this happened to him.