How to add collaborations for an event that would otherwise be split

Tags: #<Tag:0x00007f7d00ef4460> #<Tag:0x00007f7d00ef4370>

What should we do with collaborations that should be split but performed at an event together?
Just credit them individually at the same time or wait for a possible MBS update which might allow adding multiple artists performing together in a performed at relationship?

Example edit, original edit, relevant but old ticket

is what I would do (and have been doing when it’s come up).