Yes, it's probably possible to come up with a workaround that would allow us to continue using MD5 securely, much like triple DES allows us to keep using DES. Now that there's a good alternative to DES, though (namely AES), there's no reason to keep using triple DES (which is slow). There's already a good alternative to MD5, so there's no reason to kludge up a workaround.

Note that nobody ever uses double DES. That's because it is vulnerable to a meet-in-the-middle attack. Secure workarounds are hard to design.