Anyone experiment with running bcache OR lvmcache on top of zfs ON SCALE?

I’m interested in reproducing this craziness on TrueNAS Scale since its based on Debian it should work right? Hybrid storage with ZFS + Bcache + LUKS - Los Koderos

Has anyone here added unofficially supported things to their installation like the above setup? How does TrueNAS Scale handle OS upgrades if there is a custom setup like this? I am Okay breaking the web UI of truenas scale (I assume the “storage” creation dialogs would break, but I can still use the web ui to “view” and configure shares…)