Yes, very cool that Cantabile automatically replaces all references to the removed 64-bit version.
The only thing I would add for anyone else who decides to revert to 32-bit is that it appears both versions need to be registered with Cantabile to start off with. (In other words, both “VB3” and “VB3_64” appearing in the plugin list.)
For my first attempt at this, I only had the 64-bit version registered. I deleted VB3_64.dll from and added VB3.dll to my plugins folder, but despite Cantabile being configured to rescan when starting, VB3 failed to load. But all worked perfectly when I had both in my plugins folder, let Cantabile rescan, then stopped Cantabile, deleted VB3_64.dll, and restarted Cantabile.
I have actually had no crashes with 64-bit VB3 in Cantabile on Windows 8.1, but just realised my backup live laptop is running Windows 10…