Hi BaKeRK - I'm sorry I can't offer you anything helpful on your search for something to cover your bandages for swimming,
I just wanted to mention a member on here who was able to drop all her medication she was taking to deal with rheumatoid arthritis, including Methotrexate when she modified her diet.
I'm not trying you to persuade you to follow her lead, or to suggest you might be able to achieve similar things, but I feel it would be a bit remiss of me to point it out.
@poshtotty created a thread where she talked about her experiences, which is where the following link leads:
http://www.diabetes.co.uk/forum/threads/my-life-since-discovering-lchf.66929/
Just a final point; your profile suggests you have pre-diabetes which could cause confusion at some stage. You can change that via your account page, or if you can't manage that, and would like it changed, I can do it for you, if you just let me know.
Good luck with it all, and I hope your ulcers heal soon.