OK, just for my own clarity...
Your position is that either increasing Welfare, or increasing Political wage... wouldn't have any negative view, especially if they were linked???
I think there would be a risk of politicians making it political if they were in charge of their own salary but I believe the pay for politicians is decided by an independent panel - so it would be more likely to mean the welfare isn't left behind when politicians get their CPI increase.
The whole thing should be out of their hands.