You mean re-invent standards 
it’s hardly fair to call it out us not being robust already - if you want to merge two data streams (the Clock at your AR Out and the Combined activity from the Thru ) then you need to use a MIDI merge … merging is not a trivial thing to do well, that’s why manufacturers don’t just throw extra ports on
Keep in mind the Evolver is another brainchild of the guy who part developed the midi standard, you can no more beat up on him (for shortcomings) nor Elektron for not making your situation easier to wire up - you have a complicated chain, it’s time to explore MIDI mergers or flexible programmable midi patch bays which allow all sorts of plumbing … these were very spendy devices when new but can be found cheap … i’m talking about 8x8 19" rack stuff from MOTU Emagic Apple etc - there’s a thread discussing this were folks find these things very cheap (driver support needs to be researched obviously) 