glad to see you delving deeper than just the turbos.
if same layout as mine you should have a fine screen filter in the feed banjo bolt at the engine block.
if the turbos still off you can disconnect injectors and crank over to see oil coming out of oil gallery in block feeding turbo, or better still if pipe still on does it come out at turbo end.
you need to get to bottom of failures with that history.
as said above checking vnt solenoid issue would be advisable before blowing your new unit, and oil supply and drain to sump pipes.
then depending on your new turbo spec logging from the start would be an idea.
il see if I can find my oil check vid for you to compare flow during cranking if any use.
sorry had a look all ive got is after cranking dribbling out
and heres the screen in banjo(its fine)
also I wouldn't waste time doing various hybrids, youd be better off spending your time and effort making a nice drop in conversion for that gtb2060.
if you go ahead with hybrid, take a look at the height of the air channel feeding the vnt vanes, mine was lower with a step not sure if intentional but cast your eye over it (I opened it up to full hight of vnt ring).
also if your going 56 wheel there is a turbine with extra 1.8mm exducer that will drop in with a bit of machining to turbine housing(as im guessing rates would be very low to you)tip height is taller .
I think this was the part number 717904-0001 (or 00029) ? just bear it in mind