I have had an ileostomy since 1984 and have used the same appliance system this whole time - Convatec 2 piece. Yeh, it has the little clips for the tail closure, but if it's not broken, why fix it?!!! It really has worked very well for me. Wear time is anywhere from 4-7 days, usually closer to the 7 days, depending on activity and foods.
I do, however, use a mild adhesive remover where the wafer is applied to remove any residue buld-up that normal soap and water won't necessarily remove, esp. after years of use. You may not have to do this, but tuck this tip away for the future. I didn't have to do it for many, many years. I also use Neutrogena soap (soap residue wipes away very easily) and Viva paper towels in the wash, rinse, dry procedure - won't break the bank, and easy clean up! The only other thing I use is Stomahesive paste... just a small ribbon of paste around the opening in the wafer. I also am a HUGE fan of Ostofresh deodorizer - just a few drops in the pouch at each emptying and odors are neutralized amazingly well.
Best of Luck to ya - let us know about all of your sample trials. I would be curious to hear.....