Downgrade to Leia from Matrix

Is it possible to use the testing “Linux 4.9 kernel and improved video stack for Vero 4K / 4K” on Leia still? I want to downgrade from Matrix to Leia but use the 3D testing builds. I tried to add the apt changes but it just upgrades to 19.3.
Reason for downgrade, nothing to do with Vero but the Intel NUC has lip sync issues on Matrix and I use a shared mysql so I have to use the same Kodi version.

Unfortunately this is not possible.


Thanks for the reply Sam!
I’ve moved over to PlexKodiConnect, wish I’d have done this years ago instead of messing about with mysql! No different device version compatibility issues anymore.