You are greatly overthinking the issue. Wheel structure is about spokes rather than rims. Not that rims don't make some difference, but it's secondary.
The rim is mainly a compression ring for spokes to attach to, and in that role, just about anything is fine. So, choose the rim based on the tires you plan to run, then choose the spokes based on the wheels structural needs.
FWIW I've built 36h touring tandem wheels with light rims and 2.0/1.8DB spokes and never had any issues. If you want a belt & suspenders wheel, consider using 2.3/1.8/2.0 TB spokes on the right side.
Also jeep in mind that wheel build quality trumps component choice, so focus your energy there.