I was kind of thinking of replacing the cxp-33 rims with something like the H+ Son Archetype or the BHS 472w rim, neither of which appear to have an internal nipple or eyelet. Maybe modern rims don't need them. Or maybe there's a better choice and maybe going with a box profile rim would be more aesthetically fitting for 36 spoke rims on a 1990-ish italian racing bike (columbus slx frame), and, like you say box profile rims might give a more smooth ride being more vertically compliant. I'm just trying to work out my options for when I do make the change (building up a dynamo hub wheel for my commuter and buying lighting to go with it is going to take my limited bike funds first), and didn't know if these modern rims without eyelets require nipple washers, and, if so, how to figure out which ones are the right ones.

About your lubricating the nipples point, when I built wheels in the past (all 3 of them), I've just dipped the threads of the spoke and the outside of the nipple in a little pile of Park Polylube that I'd squeezed out onto some cardboard. Does that make sense as a lubrication strategy? Much more viscous than your triflow approach, but I haven't had to true the wheels yet, so I don't know whether they've bound up.