Jeff,
it's been a few days since you posted this, and no responses yet.
I have reformatted the sdhc to all possible formats. I have transferred the .setup folder from a freshly formatted cf card to the sdhc with the same results.
I assume that you've treied formatting the micro sdhc card in the Tascam itself?
My guess is that no one has responded, because not too many people have experience with CF > micro SDHC adaptors. while your concern about bending pins on the tascam is not unfounded, I think you're worrying about it too much. just remember to take a little extra care and a few extra seconds each time you insert or remove the card and be sure that it's aligned properly, and you shouldn't have any issues, even with years of use (based on my experience and other's experience with the Tascam HD-P2). As for the card reader side of things, same thing - but those can easily and cheaply be replaced (a lot cheaper and easier than the Tascam), so less need to worry there.