I would assume you can indeed use a full-height PCI card, provided you use a different riser card, if you can find it. Keep in mind that my fitment troubles came from a discrepancy between the motherboard and the provided riser card.

If your Micro-ATX motherboard has a 1x PCI-E slot and a normal PCI slot, I'd recommend seeing if you can get your PCI-E and PCI cards with half-height bracket.

Or, if you can't find them and your cards' PCBs are not full width, you can take the attachment bracket off the back of the card and fashion a new one using the blank out of the back of the case. I've done it before using a drill and a dremel for a PCI video card I once owned.