I hope to be able to shoehorn many of these into sub-one-dollar parts
    like the 12C508, because I can market these cheap, one chip solutions
    that require very few external components.

That would be nice.  But isn't the "sub-dollar" price in quantities of
50,000 or so?  Anyone know what prices are likely to be in more moderate
quantities? (Say 100.  Or 1.)

Still, it'll be a while before the ecconamically replace a 555 ($0.39 in
ones) and couple passive components...

BillW