If some of you are nerdy enough, you should take a look at Mike Oliphant's implementation of NAM for the Raspberry Pi. It's called "Stompbox". His work is outstanding.
He has developed a software that includes full signal chain effects (comps, gates, OD, mod, delay, reverb, EQ, level modules...), freely assignable, and NAM loader plus IR loader. It has MIDI implementation that lets you switch presets, effects on/off, parameters... Plus, it can be controlled with a smartphone, with his app "StompboxUI".
I built it with a Raspberry and a Hifiberry (audio interface). My latency is 3ms (not as impressive as Dimehead, but perfectly good though). Total cost, maybe 150€.
Now, it takes time, some Linux fight, and you must be brave enough to dare to use it live. I'm just using it at home so far, but it's being reliable. I'm probably using it live soon...