Gina, our concept of 'glider food' is a bit warped, really. Most of it is already people food in disguise. What is the difference between baby food meat and meat boiled whole? Water and a blender. But my gliders will go crazy for baked turkey or roast beef in a crock pot cooked without seasonings-and it's probably better for them than the post processing of babyfood.
When Gim was critical he went on a "whatever he would eat'
diet for months. He should have died then (he actually did, in fact, and was brought back with CPR), but we had him another two years even with that failing liver. Both he and Chronos amazed every
vet that met them.
Here are some foods that might tempt Fawkes's appetite, provide some variety, and most important-none of it will hurt him. (Well, it wouldn't be great for him as a lifelong thing, but temporarily is all right) Some of it has some sugars (so do the foods we use as part of approved
diets, if you get down to chemistry-glucose, fructose, etc)-not a lot of refined white sugar though, and possibly a small amount of salt-which won't hurt if not overdone.
Blueberry muffin
banana bread or muffin
If you have a Mimi's cafe, the honey soaked bran muffins were a hit here
Quaker granola (honey and nut kind)-softened or not
ice cream or sorbet (no chocolate), milkshake or whipped cream, melted-don't overdo tho.
cheese
macaroni and cheese (people kind-not too much)
Creamed corn
plain cooked spaghetti noodles
baked (in bag works well and keeps it tender) or crock pot cooked chicken, turkey, beef
mashed potatoes-cooked according to people directions
au gratin potatoes
warmed canned veggies (peas, corn, green beans, sweet potatoes, asparagus, white potatoes, chick peas, whatever)-you can try even a tiny bit of butter to get him interested
bread/rolls (not too much, they're usually enriched with iron)
make a chicken dumplings & veggies for dinner and pull some for him
If the components are okay for him-give them a try. You don't want huge amounts of salt and the same spices are still a no-onion, garlic, etc-but there are a lot of things you can try that will help round out the nutrition he's getting at least if you can find things he likes. The salt and fat content of his
diet will go up a bit, but not too much if you're careful. Gim basically ate what we did as long as it wasn't harmful, and I was exremely careful about adding salt or butter, but it was in his mashed potatoes just as the recipe said to make it-he ate it when he would eat nothing else-I can't remember everything but everything above he had, and then some.
If you haven't tried Boost as an alternate to the Ensure, it might be worth a try.
Once Gim's health started coming back we got him back on more proper 'glider food' again (though he'd still get some of his favorite people foods as treats now and then), but had we refused to try, he wouldn't have made it-he wouldn't eat and trying to force it down stressed him into bringing it back up every time.
And Riker's tried french fries a few times-they're one of his favorite rare treats. He also loves green bell pepper off a pizza. Shhh.
I take prednisone tapers (corticosteroids) 3 or 4 times a year when my neck/back get inflamed too bad-the thirst is normal. It will have to be tapered off gradually if he is ever okayed to come off of it.
The one thing I haven't seen mentioned in relation to the steroids (although I might have missed it) is the increased chance of infections-including in wounds, or respiratory, from it's use. Watch for that, and start an antibiotic immediately if you think he might be getting an infection AT ALL-ask your
vet for a recommendation, considering his other meds, for one to keep on hand in reserve for if it should be needed. Infections caused by steroid use can progress very quickly and become severe faster than normal, because of how steroids affect the immune system. Have a dose calculated so you know how much to give already if it's needed.
I've not been able to get on much, but I always read here first when I do. All our thoughts and prayers are with you guys!
P.S. Did you ever get the toys? 
Carina & Coobah 
DaisyMae; Darwin; Mareki; Mambo; Pika; Cricky; Reggie & Bobo, Pepe & Bittah 
Sinbad, 
