I've done the following:
Pen Set 1 - Plans @ 1:50 say
Pen Set 2 - Details @ 1:10 say
For example, you can assign Pen 1 to exterior walls, etc. and then call up Pen Set 1 for plans and Pen Set 2 for details. Pen 1 then has separate, but appropriate weights for each scale.
Cheers
Cameron Hestler, Architect
Archicad 27 / Mac Studio M1 Max - 32 GB / LG24" Monitors / 14.5 Sonoma