I do not think this would be a reliable solution for several reasons:
a) Typically, the magento dev command updates its mysql db tables in almost every release (without the appropriate documentation), so after each change you will be forced to manually update your db structure (it is not wise to ignore the magento update because they fix a rather large list of errors every time ( and introduce some new errors for a long time: P)).
b) The structure of Magento db is very complex, and it would be a hellish task to transfer everything to another type of DBMS with its own arguments for foreign keys and such
c) And in the last: I'm not sure that their db engine will support a new kind of DBMS (it should be Zend_Db, but who knows).
I would advise you to convince the client to use mysql (since in any case you need a dedicated server for smooth magenta)
Alekc
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