Solar tie in for 120/208

[Elephante]

I'm in the trough from my Ac disconnect ,should I tap into the main bugs that feed the 2 main disconnects that feed the building (which unfortunately is more of a hassle)?Or can I remove the wires that feed the two disconnects and bring them into the trough, tap those wires and bring a new piece of wire to refeed the disconnects?
Tap option 1: 6-4/0 parallel ,re-feed mains with 2/0,and feed solar ac disconnect---I need bigger bugs to accept my solar ac disconnect wires and its alot more work cause im clipping off the old bugs,putting newbugs and running new wire to main panels
Tap option 2: 3-2/0 wires coming from existing bugs to feed my solar ac disconnect and 2 existing mains---this option is going to have more bugs in trough but its a lot faster

[Naptown]

A one line drawing would be helpful.
A quick check with the AHJ could also save you a lot of hassle too.