I think there is a downgraded version of Agent that is free, or perhaps it is through Computer Music. Patchwork has a trial version that goes bip or something after a while, but it is ok for testing, and the test version can also hold your saves. Patchwork has never crashed here.
Another hint: Being on a MAC I can also have AU versions of pluggs and I have 32bit Lives. A program that turns 32 bit pluggs and instruments into a 64 bit interface. 32 Bit Lives are for both VST and AU but I can not get Cubase to recognize the converted VSTs. However Patchwork recognizes both converted AU and VST and Cubase recognizes Patchwork, so you can seemingly have both older 32 bit VST and AU in Cubase, through Patchwork, as if they were 64 bit, interface wise. No more cumbersome jBridge.