Re: Derived adpositions (< Linguistic term for ease of changing word-class)

Are there, in any natlangs, any synchronously-derived adpositions?

Any adpositions, that is, that transparently share a root with an extant word
of some other, large, open word-class, such as a noun, or verb, or adjective?
Or maybe an adverb?

Maybe the method by which the adposition is derived from the root is
inflection-like in that it is transparent and/or productive.

Are there any natlangs in which the class of adpositions is an open class?
(word-coinage or "rhematopoiesis" or "lexicogeny" of adpositions is still going
on, or borrowing of adpositions is still possible?) Are there any natlangs in
which adpositions are a large word-class?

If there are any such natlangs, what are they? And what adpositions are so
derived? And who says (i.e. give a reference if you can)? And what's their
evidence (or a link to their evidence) if you can say?

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Thanks.

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