If you did that? Well, it would be a bit stupid to be honest.
The M-audio would give you 8 inputs to use with the (severely crippled IMO) Tools M-powered software you would have to buy separately.
The DM32000 would then function purely as a control surface, which seems like a complete waste of a very good digital mixer / potential interface.
Instead of the DM3200 you could get a dedicated control surface, or you could get something like the Digidesign 003 (the one with the integrated control surface) that would integrate fully with Pro Tools LE.
But I have to ask the question... why are you so desperate to have Pro Tools? What do you think is special about it that other DAWs can't offer you, that means you have to severely limit your choice of hardware?
Name pretty much any other DAW other than Pro Tools, and you could get the DM3200 (with the FW expansion card) like you seem you have your heart set on, and it would instantly work well as both an interface and a control surface with no problems.
So either drop the idea of the DM3200, or drop the idea of Pro Tools. As I said earlier, unless you invest in a PT HD rig then you're not going to be able to have both!