Using VectorNAV with older firmware

Hello everyone,
I currently have a build flying and tested many hours, running on v1.11.3. For further development, I’d like to install a VectorNAV VN200 unit. Is there a way to add the necessary drivers to v1.11.3?

I am trying to avoid an update to the latest firmware as that means converting all the parameters to the new version, which is going to take many hours considering this is going to be used on a VTOL. Also there is a requirement to do test flights taking many hours, which I am trying to avoid.

I tried to use kconfig to add the drivers on v1.11.3 but that did not work, or I was missing something.

Thanks for all the help in advance
Best regards