I can understand the dilemma! What a pain. I have issues of LR4 seeing older PhaseOne TIF format files. It only sees the preview tif!! Welcome to my world of Format Ffff.... what ever you wanna call it.
Just unacceptable. There must be some overlap they can't get over. Canon was able to get over this with their 1Ds TIF files. It sucks.
For making images for my client needs, I have to use 2 Photo managers, and 2 RAW developers....and its not like the files are isolated...its back and forth regularly.
Sometimes I feel like I'm dealing with construction contractors ??!! DNG format isn't an end all solution. There was drawback to DNG, and it was a bit inconvenient, or limiting, so I used it a few times, and decided to switch back.