I can't find any details of KLM's list of codeshares on WY more recent than when it first went live in 2015, at which time KLM only appeared to codeshare on WY flights from Muscat to India, Bangladesh and Pakistan. I'm not sure what routes AF may have codeshares on.

DAC is the only destination served in Bangladesh by WY, but searching on KLM's website for flights to DAC instead routes you via BOM with a connection onto Vistara; I can't verify that WY codeshares are actually still available when purchasing from KLM.

Your advice is great if you happen to be travelling to one of the few destinations for which a codeshare is available, but you certainly can't book each and every WY flight as a codeshare that would earn XPs