POE bump-in-the-wire conversion

Perhaps someone from this august list can offer a clue here. Have: Cisco 3524-PWR (paleo-POE, pre-802.3af Cisco standard). It runs the 7960Gs great. Have: Wireless AP stuff that wants 12v on the unused pairs for passive POE. 48v will let the magic smoke out. Might buy: phone that does 802.3af Want to run these with the 3524-PWR. I can't imagine that nobody makes a bump-in-the-wire converter for this application, but haven't been able to find anything other than 802.3af to the passive POE use case. Anyone got a pointer for me? Thanks, -r