Unfortunately, not yet.
I had some work and travel for part of the holidays - and then got suck by weather/airport delays. Since I didn't have my tools, I was unable to experiment with backing up and restoring my phone yet.
Looking at the link again, it seems like this might actually be an app I could install - but I'm not sure how to build it. Last time I thought it was just a module built in to LOS. Or am I misunderstanding?
I'd be happy to try installing it on my current ROM, if you think that would make sense. Otherwise it might have to wait until the new year.
My previous understanding was that the hardware itself on the Japanese motherboards were different; I feel like I've seen posts about people installing the US ROM images on them, but it still didn't work. But I might be misremembering.