Get some expensive lightweight alloys and zip tie coroplast rings to them. Best of both worlds.
For what it's worth, I've been keeping an eye on aftermarket 16" options myself. RPF1's come in around 13lbs and aren't all that expensive. Next step up is forged ($$$), where you're looking at TE37's (11.5lbs) or T66-F (10.5lbs).
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