I have a bunch of matched jfets I was planning to list, but life is too crazy now... I drug them out of a pile and moved them to yet another pile and am not sure where they are, or I would check. Hit me up week after next and I should be able to have time to locate them.
I think the worst case scenario is one of the outputs is stuck at negative rail. Other than that I am not sure what could really happen catastrophic...
I have a $15 DAC for sale on EBay that might work. I can send it over in a bubble envelope for you to try and you can throw it away if it doesnt work. Definitely meets your space requirements...
niner: its always useful to learn to read a schematic. Sometimes there are things on a schematic that aren't translated to PCB artwork that are useful to know. You need to remove two capacitors on your T2 build, check the schematic for more info.