So I saw https://www.xda-developers.com/developer-boots-android-11-22-older-devices-project-treble-gsi/ and it got me curious to see if a GSI would work for the Stylo 4--The answer is yes, it boots an Android 10 GSI fine

with WiFi and data working it seems, too. spicy. I did need some minor /vendor partition changes to make it agree though, but heck I'm tempted to try this on my Stylo 5

anyway I should really get around to publishing the remaining bits needed to actually do this generally... it's still very fragile and I don't like putting out things only to do a bunch of user support but a lot of it generalizes probably