Well, there's Italy - they seem to have a pretty good equivalent to OTL's socialism in Enrico Berlinguer's legacy. Besides, no reason you can't adhere to your own brand of independent politics. Sure, you probably won't get near power given OTL's party entrenchment and the likelyhood of such a system developing ITTL, but still, not like you're going to get run down and shot for taking a mix-and-match stance, eh?
(*note: only applies in non-authoritarian democracies, results may vary)
Also, well, not to make this awkward but...
*is a non-Borisite Tory by disposition*
I mean, I support Starmer, but that's a matter of him being better for the country than Boris. And not being Corbyn.
Sorry, didn't mean to bring up OTL politics, just would've felt awkward and disingenous otherwise.