Previously I had tried a series of one click solutions but I haven't found any that support this device yet. Typically they use the same exploits we've tried to use the hard way
After slacking for awhile I was finally able to poke around some of the internals of the phone in FTM mode using qualcomm developer tools. Lots of nifty things in the embedded file system and plenty of opportunities to flash new boot loaders and roms to the device for those of you who have a locked bootloader, but unfortunately I haven't been able to extract a copy of the stock rom or bootloaders. I'm still lacking the information I need to compile a new one for the phone.
Where I stand:
Can create a root shell, cannot remount system as read/write for permanent root in stock rom.
Can install new boot loader, no twrp or other found for this hardware.
Can compile new twrp, no boardconfig files (handy to avoid bricking your phone)
Can explore EFS and access chip via FTM, not sure how or if possible to download current rom / bootloader from here.
Happy for any tips on what to try next!