Hi, have crazy project I am trying. Please do not ask why. just because.

Old trek 1000 with shimano 6 speed index originally double front crank.

Want to switch to the following:

Rear wheel suntour superb hub and suntour pro 7 speed freewheel (the one that is narrower spacing than shimano to fit 6 speed wheel dish)

shimano r700 compact crank

I have available suntour 7 speed index barcons, shimano 6 speed index downtube shifters, friction shifters,
Suntour superbe pro rear der for rear, orginal shimano 6 speed fd, also suntour triple compatible fd, bunches of other parts.

My main concern is the 7 speed suntour freewheel and the shimano compact crank. Can I use a narrow 8-speed chain and get all this to work smoothly?