First I highly recommend that pilots call their union reps and ask that fixing the issue become a priority. I recommend "job portability".
Your idea unfortunately does not solve the issue. Your idea would get junior guys off the list, not the problematic senior guys. The other issue is that it would increase operational costs not reduce them. This would mean every pilot would have to be dual seat qualified and all FOs would have to complete PIC PCs. This would increase recurrent training requirements and therefore training costs. Also the administration costs of tracking which pilot sits where and who is the PIC for the flight would be much higher. Just the staffing required in SOC/OCC to answer phone calls and resend revised releases would have an airline cringe. I won't even get into the safety and legal issues.
I do applaud you trying to come up with solutions to this mess, please keep them coming.