Well, I use something called VST-DX Wrapper from a place called Spin Audio (
www.spinaudio.com.) But I just went to their web address to see if they still had it and one of those bogus generic search pages popped up. Either they changed their name or website or got bought out or went out of business, IDK.
They had both a free version, and one that cost just like $20 or something. This was a few years ago. The difference was the free one only allowed one plug at a time but the paid version allowed multiple simultaneous instances.
Now I don't know what to tell you. Last I heard, Cakewalk also had a wrapper, but I know nothing about it or whether it's still out there or not or what other options are out there now. But there's got to be other options than the SpinAudio one.
I'll bet you the Sony support forums have been asked that question a million times. You might want to check there.
G.