Well, Disaster Area's MIDI footswitches tend to be popular with other customers. This one for example might do what you want:
http://www.disasterareaamps.com/shop/dmc-3xl-gen3
I don't have any of their MIDI footswitches myself so you may want to contact Disaster Area support to double check with them that it'll do what you want. Or maybe, someone who has one will comment.
There are a lot of options though with regards to MIDI footswitches. So, one thing you'll want to consider is whether you just want a small device with 3 footswitches that does just what you're describing or something bigger with more features. The price may end up being the same…
