I already feared that answer because I'm not able to build a twrp from source ^^
But in the meantime I managed to boot into that "non seeable" Twrp and did the following:
twrp wipe data
twrp wipe cache
twrp install /sdcard/gapps_nano.zi...
Yes, this app has been recommended by multiple GSI creators. Out-of-box compatibility is another thing though. If you're getting an GSI you should look for "arm64-aonly".
Cernodile hey bro what happened about the LG Pecan ROM? are you working on it or left the development?
I have been having lots of things going on irl, I'm trying to find spare time, sorry for delay!...
yeah sure... i still own this device... i will use your ROMs for sure.
I'll start by making full-performance beast ROM.
Thanks for showing up support!