Neil
I have 24 strands on my tree and used some 12 strand sequences last year. I cut and pasted the first 12 strands of effects in LOR to the strands 13-24. (of course after I added another 12 CCRs to the LOR config and removed the macro channels)
Most 12 strand sequences looked great doubled up on the 24 strand tree. Try it and with the offset capability in LOR you can still center it up and have some cool sequences/effects.
Cheers,
Steve