Adding one update to this thread as I saw a comment from @joao.azevedo in another thread:
I haven’t played with the VM I mentioned in the older posts here.
Aside from the bm818-tools expecting username “purism” has anyone else found any side-effects from changing the default username?
I’d still really like to rename the hostname (seems safe) and the default username (seems mostly safe?) once I get my L5.