I put a design doc up for review at ⚙ D143587 [Docs] Multilib design. Hopefully that makes this whole thing more accessible to people who aren’t already familiar with the design space.
I’ll be on holiday next week but I’m hoping to start getting the patches landed the week after that unless a major issue is identified. The changes have had a good number of eyes on them so it feels like the time is approaching to understand how well it works in practice, and use those insights to update the design.