Leadfoot
I have the Focusrite LiquidMix, MTron, and Kitcore, and they were all just about unusable in 64bit before purchasing the jbridge. Now they work like a charm. Jbridge is definitely worth the money, for me anyway.
MTron, unless you have the really old, original version is now 64 bit. Check you account and you should find the upgrade files.
Kitcore is a sad case, so much potential but all development came to a grinding halt as soon as Sonoma Wire Works bought out Submersible. It used to be my go-to but I have not even installed it on my new DAW. I may do so at some stage as the midi is particularly good, even if the sounds have been eclipsed by my current drum go-to Superior Drummer.
For the few remaining 32 bit VSTs I still use (Minimonsa, B4 II mostly) I find Bitbridge works fine. I do have a Jbridge license but do not have it installed at the moment.