Also, instead of skipping rows, just use F0x with a smaller speed, or Fxx with a faster tempo. Or if this is for playback only, just adjust the speed at the top.
Better yet, Jandazekon, since you're most likely NOT making music to play back on an actual console or emulator, just export the WAV file & reverse it in Audacity or some other sound editor.
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For the playback. I would try to search for a value that increases over time in all frames. It counts from 0 to 64 in frame 0. Then on frame 2 it goes back 0 to play the beginning of frame 2. Then after step 64 on frame 2. It goes to frame 3 and counts again from 0 to 64 in the counter modulo loop.
Using cheat engine for that. And i don't how to quantize address values because that needs the script engine of cheat engine to make things like quantizing the counter and replace the different values by values reversed ranging from 0 to 64. The value 0 = 64.
The value 16 = 48. The value 32 = 32. The value 48 = 16.
One thing I've done in other trackers was a combination of the equivalent of Bxx and Dxx on the same row, Bxx to the current frame and Dxx to the previous row each time, running the whole frame backwards. I don't think this works in FamiTracker though, because it applies these effects in a different way. (It's just a silly trick anyway.)
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