Hi @waynesEOS you could consider compiling TWRP yourself How can I get TWRP for my device? (how to compile TWRP).
There is talk of being able to flash a GSI without TWRP
Please be sure to backup IMEI if even thinking of fastboot erase/flash.
Bon chance
Edit. To be sure of optimising your searches for any progress with a LineageOS for this device, be sure to: [HOWTO] Find device codename 