I forgot to add: there's 12 games per round. So each template would need to be covered twice, by two different players. I does add a twist, compared to CL.

Sounds really cool :)

i think the swiss system we currently have is quite nice and I don't really see why it should be changed.
seeding within teams sounds cool and indeed gives an edge to the stronger team but practically it won't work.

Why do you think it won't work?

I came up with some ideas about matchmaking but I think the best was that teams will decide their respective opponent, instead of being random. Facing the same oponent twice would be possible in this situation. e.g.:
-Team A decided their opponents
-Team B does the same simultanously

if the option of facing the same opponent twice is disabled, then team B would have to pick after team A
made their choices

This is to improve strategising and to satisfy those with personal feuds