you can redirect lnaddress with no issue.
domain.tld/.well-known/lnurlp/username to let's say https://getalby.com/.well-known/lnurlp/username
this will let you use username@domain.tld as an lnaddress.
Discussion
a working example is skander@slothy.win currently redirecting to slothy@getalby.com
Which is a redirect from https://slothy.win/.well-known/lnurlp/skander to https://getalby.com/.well-known/lnurlp/slothy
Is this also possible with GitHub pages? I tried it myself but could not get it to work. I thought I had to configure the .htaccess file, but that doesn't seem to work with GitHub