First, use TWRP to format the system partition. That will fix it so it is mountable again.
Then, flash the desired parameter patch.
Then make sure you have the TWRP flashable version of my ROM and flash it.
That should get running with a desirable storage layout. You will still have an internal :"sdcard", but the space will be limited to whatever is leftover after the data partition was created.
ShaunMT
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