If your ileostomy is oval or has an unusual shape (not round), then cut-to-fit wafers are typically the preferred option still unfortunately. Because if it doesn't fit almost snug all around, leaks occur much more frequently. Plus sometimes the stoma changes shape a little and you need to be able to adjust right away for that occurring which precut wafers don't have that option.
Perhaps using some sort of vise clamp mounted to a small table to be able to cut your wafer to your exact size?
Also I highly suggest, after removing a spent wafer and scaping off any residue barrier adhesive, is to use oil free eye makeup remover (cosmetics isle) to soak the skin around the stoma and clean off the remaining (often invisible) film and nourish the skin, use no water or anything else until you do this. Then once clean wash the area three times with water and a plain soap like Ivory. Ensure the skin and your fingers, is absolutely squeaky clean by rubbing, this the clue that's it's as clean as it's going to get. Keep your fingers squeaky clean until your wafer is fully applied, like don't touch your face etc. where more skin oils can get on your fingers then ruin adhesion.
Dry well of course and apply no other items under the wafer except stoma powder (a thin crust in wounds if needed) and Coloplast PREP dabber bottle skin prep as it creates a rougher surface for adhesive to bond well too.
When you apply your wafer, any barrier adhesive goes down first, rings will be difficult with only one hand, but a no sting paste would be easier one handed.
After the wafer is applied use a toilet paper tube to press through the wafer around the stoma for a good 5 minutes of steady, even pressure using the palm of your hand. Wait about a couple hours without moving afterwards has been my best experience, gives time for the paste to set up. I can actually feel the difference now, it's very slight though.
What this will all do is create an extremely secure barrier adhesive bond to the skin and with light rinsing with a hand held bidet, you can get extremely long bag wear days. Less bag changes means less effort and if you need assistance anyways, less times they will have to do it for you.
I now get anywhere from 6-10 days out of my one piece and I have a belly fold, a grameolula and a chest scar divot to deal with as well, but I've adapted to all those and I'm positive you will overcome your challenges as well.
There is another possibility, there is a company that is experimenting with more longer lasting wafers that are 3D printed to match your body contour held in place with medical grade silicon much like a prosthetic so all you have to do is use the bag portion which might be easier for you.
https://www.odapt.org/
I wish you well and hang in there.
