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If you can afford the replacements when you crack it, it's fine, and a metal rim will dent beyond repair on the same hit. The main issue is your idea of 24h rim to 32h hub, it's just far more of a PITA than is justified. 16/8 is a good idea for a highly dished wheel, but it really needs specifically drilled hubs and rims to be optimised, and I'm guessing your use case has little or no dish. If you want to pose about on a 50mm carbon rim, just get a ready made 24 spoke carbon wheel based on a 24h Novatec flip-flop hub, or if you already have the 32h hub and want a project, buy a 32h rim.
gbj_tester-
It will be a dished wheel since I'm gonna use a 5/6s freewheel with it. I cannot use these ready made wheels with flip flop hubs, they're not compatible with multispeed freewheels ... I don't already have the hub, but I can't find any 24h hub that fits my needs.
Also, what do you mean by "PITA" ? I'm not a native speaker so I'm a bit lost
user136820
Can you elaborate on why a 50mm carbon rim isn't a good idea for urban riding? It's a real question, no sarcasm