if you're talking about running a reseed server through a vpn i think you could do this but i wouldn't. pretty sure you need an outernet domain name with ssl cert. if the vpn has a dedicated ip this could probably be setup, or look into doing reverse proxy through one of those dynamic dns things. never tried that so no idea if or how it'd work, but probably be easier running off a vps somewhere sans vpn. i know everyone loves cloudflare but that could also be an option https://homepage.np-tokumei.net/post/notes-i2p-reseed-over-cloudflare/