SUCCESS! I'll post my results for some future poor sap with the same problem:
Wow, this is like one of those real time live chat help applications on some shopping sites! (sometimes you love the internet. sometimes you hate it. this time it's love).
While I was waiting for your reply, I found a similar tip you posted for someone in the past, Jeff. I was able to push that center pin latch with my finger alone and it popped open the passenger side latch (hurray!) only not the driver/hatch lever side (boo!)
I also found a post explaining how the handle (mine got all loose goosey to use a technical term) pulls on a lever on the inside that tips/pulls the lock for that side of the hatch as well as pulls on the cable that runs over to the other side of the hatch.
well the handle is attached to a post by a short shaft and held on with a 10mm nut that got loose and so wasn't pulling that lever which unlocks the soft top cover. looking in the trunk i could see that lever getting joslted when i reached over and jostled on the loose handle. luckily that lever has a few nuts of its own on there and i made a loop out of some a-wire and fished it through that trunk hole til i could (easily) visually see the loop went over that top nut on the release lever (i hope you are following this!).
slipped it over that top nut and pulled on the wire which pulled on the top of that lever (which is what the handle is supposed to do) and POP! it unhatched. easy once i figured out (saw) what was happening in there. (by way of a gap through the trunk hinge).
so it was that 10mm nut that some have replaced with a lock nut and so shall i when i find one that size.
Until then, i threaded my a-wire through a whole on the top of that lever that happens to be there, and left it threaded through into the trunk so even if my tightened down nut ever gives up again (before i replace it with locknut + loctite of course), i always have this emergency 'pull' wire in the trunk for now.
thank you for your help jeff, and i am posting the above (long and detailed) description for some future karma to someone else who falls into this common problem due to an achilles heel of a poor choice of nuts.
chers.
TomL, Portland, OR
1964 230SL Euro 4-speed Silver+Black w/ Red Interior
1973 280C DOHC Metalic Blue w/ Tan interior