Quoted from Pac-Fan:

The small one won't work, not enough pins across (J1/J3 are 28 pins). Bigger ones could work (with apparently very little extra cost), but since the traces are all inline, then you run into problems for the common connection point of the SIP resistor arrays (they would have to float above the board and jumper wire soldered directly to it, thus being the first point of failure while installing. Perhaps offer a cheap, ugly, "no warranty if you break" option with those for $20 and the better designed ones for $30 -- If I can find a fab.
But definitely thanks for the suggestion; perhaps to get out "something" it's better than "nothing".