Self hosted music library best practices for iPod music sync

Ok so bit of a stupid and probably easily gotten around problem. I’m self hosting my music library on my NAS and mainly use it with my Jellyfin instance. Files are mp3, WAV and FLAC. Just got a modded iPod forgetting that Apple uses ALAC and just ignores FLAC files on import. Currently I just downloaded the library to my MacBook and ran a convert script which was fine, some files may not have worked properly but that fine. Wondering if it would be best to convert my library mom the NAS itself and add the library remotely to Apple Music to sync files that way or if anyone has been in a similar scenario? I know rockbox is a thing which would be the last resort really as I like the stock firmware. Any and all suggestions welcome and appreciated. I’ll probably just continue to copy the library over while it’s still at around 260gb to avoid messing with any transcoding issues due to the server files being converted to ALAC.