Be careful what you wish for!
For decades, I have baked and eaten Hallowe'en pumpkin and the seeds. Kid tested and kid approved.
I never, ever had a problem feeding this to my kids when they were little.
Fights about who got the most. Tears if we ran out. Not much for Daddy.
Spread the seeds and muck on paper. Clean the seeds a little and soak for 2 hrs in 1C water + 1/4C plain salt.
Spread on a sheet pan and roast in a preheated oven at 350F. Watch! They brown and burn easily.
Normally, the seed coats are so thin that you can eat them whole.
Cut the flesh into large slabs. Score a 1/2" dice with a knife point but don't puncture the skin.
Rub well with butter and sprinkle heavily with brown sugar.
(one of these years, I'm going to use molasses (treacle?) on a few pieces.)
Next, sprinkle heavily with cinnamon, cheap stuff is good, a lot of the aroma blows off in cooking.
Onto a sheet pan into a preheated oven at 350F. Might take 40 minutes.
I'll poke it with a fork as it softens.
Fruit leather: I don't see why not. Just slab the flesh like you are making jerky.
Cinnamon, nutmeg and brown sugar for seasoning?
Before I forget: Some years back, I was taken to a fruit winery. Annoyed as I felt obliged to buy something at ridiculous prices. I bought 2 bottles of pumpkin wine. Yes, I did. You don't need to ever do that at all. The world is better off without pumpkin-flavored wines.