You will most likely have old dead roots you need to remove anyway. I usually leave the living roots as you will at least need to leave some roots to anchor the plant in the LECA. If you have a lot of living roots and think you might have too many for the pot, try removing the longest 1/3 of the roots or the oldest 1/3 and remove the entire root (not 1/3 of each root).
I did successfully convert a 'Sharry Baby' after removing all the roots. But I had to put a lot of stakes in the pot to try and hold it and ended up rubber banding the plant onto the pot to hold it in place. It was a real PITA and now leave roots to anchor my plants.
Cheers.
Jim
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