Hi Chuck, no worries if you are cool with doing the routing mods then go for it. I would estimate the bridge would need to move toward the nut about 24mm (19mm scale length difference + 5mm correction) so I think the tele bridge plate will cover the existing bridge pup cavity.
The Gibson type bolt on necks available at PBG shop have only got dot fret markers as far as I know, only the set necks have trapezoid and block markers. I think the Gibson bolt on necks have a square heel so should be interchangeable.
What is the reason do you want a 3 + 3 tuner config on the headstock ?