Read your data sheets. Enough turns of tape will be okay, particularly if you stretch it.

If your machine is working without tripping the RCD then my concern of earth leakage is void - Go for it.

My earlier recommendation of removing to PSU was my experience with a K40 laser was the enclosure was a terrible place to work with EHT - enough "woah!" moments for someone as lazy as me to even remove the PSU from the enclosure to dry it off.