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OK....next test:
Test for 12v at V/GN at the X49/2 plug [ terminal #3] with ignition sw in Start position. That verifies K38 contact set circuit [ just above the gas pedal]
..or, you can do the same 12v bat jumper as you did on x27, but to that point at X49/2 for starter activation in N or P.
If starter works with jumper power to there , k38 circuit is open. If it does not, then you have a bad NSS.
I would also do a 12v test on both sides of fuse 5 to ground w/test lamp before checking k38 relay circuit, just for power verification for relay coil.