From my conversations with JZ and Leo, it seemed there was no package that generated the appropriate mex files. It was clear that the right ones weren't there from the absence of a /cvs/cds/caltech/apps/linux64/lib/matlab2010b directory. I'm sorry if I screwed anything up with pynds, but I have repeatedly asked for help with NDS2+matlab and no one has done anything.
It would be nice to do it via apt if there indeed is a versioned package that can make the mexs. Sorry again if I jumped the gun, but I didn't think anyone was going to do anything.
I guess the only 32-bit machine I can think of is mafalda.
About tconvert, I think the best solution is to make a new wrapper M-file. gps was just a convenient remnant of mDV, but all that we need is some matlab function that can output a GPS time given a date/time string. We can use whatever command-line utility you want.