i’m very satisfied with j-bridge, i have a couple of vst’s which can be sketchy but the majority run very smoothly.
in this case, though, a kind programmer has taken it upon himself to update the mda vst’s to 64 bit. they’re posted here:
https://sourceforge.net/projects/mda-vst/files/mda-vst/mda-vst-src%20100214/
look for the ’ mda-vst-src 100214’ folder.