No, yeah, I didn't mean you only need to update the URL, although that is what even I would infer from my statement...sorry.
Hmmm.
So, if you get this worked out, and can have the option enabled in HoG to not wipe data, and then I were to test installation on my Taimen by installing on top of what I have installed now (ignoring the fact I lose root - I can fix that myself), do you think that it still would not qualify to receive OTAs since data was not wiped?
I suspect that the most likely scenario would be that yes, it loses the ability to receive OTAs. And based upon that, I would probably need to make a full backup of the Taimen in TWRP before attempting to play, because my other alternative to restoring my device if something were to go wrong would be to flash the latest Pie system image, restore data from TWRP backup (or just let Google do it), uninstall Magisk from the restored TWRP backup (if it works), then wait for the Q DP1 OTA to come in again (which might require me to do things like opt out and sign back up for the program in order ot receive it again), install it, and finally flash the Magisk canary build to get root back....
And I won't have a lot of time to do that this weekend, at least until Sunday night. Visiting a buddy and his family (his boys, just shy of 2 and 3 respectively, sent me, through his mother in law, the cutest Happy Birthday video I've ever received), then off to a combined birthday celebration tonight, and meeting my folks and sister in Atlanta for my actual birthday celebration with my family (Yesterday, thanks to the forecast from the previous week, the bomb cyclone was supposed to bring us a $#!+ton of rain, so we postponed my birthday dinner until Sunday lunch - and we didn't even get a drop here....). So my celebration with my family tomorrow is a combined birthday and St. Patrick's Day celebration....
So, the earliest I would be playing would be Sunday night.