One thing that's still not clear: can I just chuck a clincher and tube on this or will it pop off the rim (Ambrosio Crono)?
can I just chuck a clincher and tube on
No. Tubeless is not the same as tubular. Ambrosio Cronos are tubular rims and can't be used with clincher tyres. It's not so much that they'll pop off - more that you won't be able to fit a clincher tyre to a tubular rim in the first place.
@Brommers started
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One thing that's still not clear: can I just chuck a clincher and tube on this or will it pop off the rim (Ambrosio Crono)?