I've been using this rom for the last 3 weeks and I love it.
I'm also using the adaptable storage, which you can activate easily in settings->storage (I don't remember the exact steps but I think It was something like "format as internal memory" in the 3 dots menu on the SD card screen. You then just select migrate data to SD)
As for the installation process, I started with a fully stock PRA-LX1, and it seems to me that you just have to follow EXACTLY the steps provided by DarkJoker360 (including the ones in FAQ post and in the other linked threads), so no additional flash needed. The only difference for me was that I needed to use Askuccio's recovery because the suggested one couldn't wipe /system
Also I really suggest using Magisk 19.3 (the 20.x one bootlooped and the 21.4 one couldn't pass SafetyNet in ANY way). With this version I was also able to fully use Google Pay and to have the phone recognised as legit in Google Play (by using an older version of ARCore, messing with a database file, and resetting google play store data while the phone was in airplane mode as suggested somewhere on this forum)
If anybody needs them, I'll provide the ARCore module file I used and the Askuccio's recovery file (as they both seem vanished from their original sources). Also I'll try to find which other threads/posts I read while trying to find the best setup if anybody needs them.
I suggest fully restoring the phone to its stock state before installing the rom to avoid ending up in untested situation (unless of course you explicitly) want to see how let's say a certain kernel behaves with this rom.
The only issue I've encountered so far is the lack of GPS, but I won't need it any time soon as we just went into a new full-scale lockdown where I live.
Very good job, hats off to the dev