Best way for existing GPS-RTK-SMA ZED-F9P breakout board to receive NTRIP RTK via...?

PaulZC, I am happy to report success - in about 10 hours over 2 days.

I followed:

Got a prepaid Android phone too for the NRTIP link.
Tested it using the U-Center Deviation Map and can easily resolve position differences of less than 10cm XYZ.