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Tricky NAT over GRE configuration. Could use some advice

I recently received a request to setup a GRE tunnel with a vendor for a POC. I have setup the tunnel on my edge Cisco router and can ping the vendor's server, so the tunnel works. The problem is their node is on a subnet overlaps with ours. So to make it work I figured I'm going to have to do some sort of NAT. Here are the particulars:

Our side: - Users - Users

Their side: - Node

I figure I can NAT to on our edge router and have our users try and connect using the address. So I'm guessing I would have to have this NAT command go against the inside interface so it can NAT the traffic and pass it through the tunnel. Can this work? Would I put my commands on the tunnel interface or the inside interface?

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