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I haven’t mixed and matched on my road bike, but I use a shimano, chain, cassette and chainring with an axs mech on my mtb and it’s flawless. Arguably better than what it was with a full sram set up.
I imagine axs road mechs with 12 speed shimano cassette, chain and chainrings would be fine.
FD shifting might not be ideal though due to the different tooth jumps from big ring to small ring.
Thanks! I was contemplating 11 speed eTap for my road bike for a while, but the availability of spares is just too much of a concern.
I actually took the plunge yesterday and bought some new Rival AXS stuff. After some reading of other forums (mostly WW), seems there are lots of people who seem to have got AXS working perfectly well with Shimano 12 speed bits. So I bought the following:
Ultegra 12 speed cassette and chain
Rival FD and RD
The wireless blips
Praxis rings for my existing Red cranks (Praxis say they are AXS and Shimano 12 speed compatible)
Need to source a 'master' controller to pair with the derailleurs, but there's a pretty knackered (but still working) Rival shifter on ebay I'm watching.
It's definitely experimental and for now I'm just going to try it on my old TT, but I'm hopeful from comments online that it will work. Worst case scenario, I'll just buy an AXS cassette/chain and XDR freehub/wheelset (would need to buy a disc wheelset for the new TT frameset I have my eyes on anyway).