Well Dan, it's been a few years since I used that on the Maier ML-32E machines. All I remember clearly is that it didn't make much sense, but it was simpler than it looks. IIRC I used lots of "zeros" for most of the fields, but the "R" value had the angle of rotation.
I'd start with that. Put the R at the angle you need, and on the cancelling G-code, you be sure to put the same angle. I think (not positive) you had to put the R value of the cancelling G69.1 as a negative ( or opposite) of the G68.1, but all the X, Y, Z, I, J, K, except one was zero.
What I do remember clearly is that once you got it rotated around, it worked beautifully. All the offsets carried, everything worked. I did rigid tapping and helical milling while rotated. I think you had to call the offset of the tool into active before executing the G68.1, but you'll gave to play with it. I think there's enough variation in the way Tsugami vs. Maier may have set up the control to be different. I do know that I had done multiple operations and many tools while rotated, so not sure about the tool calls within a G68.1/G69.1 cycle. I looked through my personal files, but couldn't find anything saved. Nuts.
BTW, the Maier machine used a 160iT control. They eventually made the operation a lot easier by creating a pair of custom G-codes to avoid the confusion of entering in all the zeros. In fact, it was me who did that. Damn, why didn't I keep any of that info!