Finally managed to set up tvheadend with rebreoadcasted IPTV from a private group with functioning and automated import into jellyfin.
Works very well (if the IP stream doesnt crash)
Edit: Spelling mistake.
Additional info: Took me 3 weekends to figure out how it all works together, finding out that firefox browser neither on desktop nor android can play live tv on jellyfin (even with transcode) and that EPG is a bitch to get right with obscure tv stations.
And webgrabplus has asinine documentation. Meaning: non existant. Go figure it out yourself what each parameter means, lol)