Nifty idea Rharv, but unfortunately it doesn't work. With data already in RB, a tempo change doesn't alter the relationship of the data to the grid: it simply makes it go faster (or slower)and the timeline changes accordingly, which when you think about it is exactly what a tempo change routine should do.
So next I went back to my 135bpm Biab Take five and dropped it into RB set at 187(not an exact integer correspondence but close enough to see if the strategy would work)with a 5/4 timesignature. What I got was a fast Take five with five music beats in the space of four beats on the grid, just as previously.
What I need is to be able to alter the timeline independently without changing the information within, and there's very likely just no way to do this.
If on the other hand RB could generate coherent material in a 5/4 style while set to 5/4 all would be well, but it seems it wont so I guess I'm snookered.
Clinton.