I bought some inexpensive single wall aluminum rims with the same number of spoke holes, laid them on top of the old factory wheel and just 'moved up' the old spokes & nipples from one rim to the other. A little touch of true and I was good to go.
Huh, I haven't seen ERD specs on many of the 16" rims so I figured I would have to buy one, measure it, then buy the appropriate spokes, but single wall rims take a lot of the variability of ERD out of the equation. I'll have to give it a shot!