Nope, but good thought. Figured it out though:
PSP MasterQ only runs on 32 bit OS X. So it’s not WL8.5, but OS X that’s blocking it. JBridge probably can’t help that. I just need to install WL8 on an old machine to open it (not revving my work DAW back).
That said, the whole thing has me facing the future directly. I went ahead and updated WL to 9. 