Are you wanting the entire navigation unit assembly, or just the touchscreen? If the latter, I should have one from an otherwise bricked head unit. Feel free to DM.
I was going to say, but Matt beat me to it, that the bare touchscreen might be interchangeable with the ICE RAV4 of similar vintage, such as 86100-0R032 (note: one digit difference from the EV version 86100-0R033).
This would have to be researched or pioneered, but if I was in your situation, and couldn't find a reasonably priced used nav unit, I'd be tearing into mine to see if an ICE version's bare display could be made to work.
I am by no means an expert on ICE models, but I don't think there was ever an ICE RAV4 that used the home button interface like the EV. I think the 032 version is just an older rev of the same functional assembly.