You can get fake nylon tattoo sleeves. Can I source customisable ones? Using tights/nylon:
https://www.nobiggie.net/diy-fake-tattoo-sleeve/
Looks like I could get customisable ones if I had a digital design, but idk if I can design it simple and flat to be suitable for that?
Tights/nylon looks like the best DIY shot, but it would only cover the arm part, not the shoulder. Probably still worth it as a test. Internet suggests using heat transfer paint to get the design onto the nylon. Could stick flat nylon onto the shoulder with glue? Might not stick flat.
to the touch 