Crankset critical dimensions

[One-eyed Sailor]

Hello Rats, hope you are all enjoying nice spring weather!
The more I learn about bicycles and geometry, the more questions pop up in my old head.
Today's question reguards Q-Factor (I think that's the right term, how much clearance you have between the arm and the chainstays).
I know that BB width also affects Q-factor. Mine is square tapered.
I'm trying to find a single-ring crank that mates to a Sturmey Archer hub with a chainline of about 42mm-46mm depending on the cog (dished or not).
I have chainline figured out but the two crank options I currently have both hit the chainstays. A wider BB throws off chainline.
With the S-A hub I can't dish the wheel to help my problem. I thought about using ring spacers but that doesn't seem to be a great option.
I need W4 to match my CL needs while W5 clears my chainstays.

The problem-solving involved in bicycles is a big part of why I love wrenching on them.
Any advice is welcome.
Peace!

 

[ancdmd]

This is the factory 36T crankset on my Genesis Onex, with a 118mm BB and roughly 44mm CL. I bought another crankset on Amazon to replace it and it wouldn’t fit due to a much smaller “W5” measurement, which didn’t allow room for the crank arms the clear the chainguard (which I wanted to keep on the bike). I haven’t shopped for another crankset since, due to not knowing how my W5 dimension would be affected. The Amazon crankset, which seemed decent:

PETCHOR Square Taper Crankset MTB, Mountain Bike Single Speed Crankset, Bicycle Crank Arm Set 170mm 104BCD, 32T/34T/36T/38T Chainring & Bolts https://a.co/d/cYDPRMQ

 

[linmcrae]

This involves skills so in advance of mine but I love reading and learning. Lin