I too made the deliberate choice to go to all 64-bit plugins, and my system has never been more stable.
I have a single project left with a freeware 32-bit Minimoog clone, called MinimogueVA. It has served me well, and does work in 64-bit Sonar, but I was able to take advantage of a fantastic deal on the V-Collection from Arturia, and one of the 10 synths I got for $199 is their Mini-V, which is a reasonable 64-bit replacement for the MinimogueVA.
The V-Collection also has 64-bit versions of: Juno 8, ARP2600, Modular Moog, an Oberheim, and some other stuff I can't recall. GREAT deal - it is now back up to $399, so I am happy to have gotten it when I did.
Anyways, 64-bit plugins in 64-bit Sonar are extremely stable for me, and I am having more fun than ever with it all.
I agree, BitBridge was OK, JBridge even better for some, and not needing either is best of all.
Congratulations on completing the switch.
Bob Bone