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hercek
Marlin firmware can be easily updated to support different rod length for each tower (Repetier even supports this out of the box). But rods connecting to the same tower must be the same.
That's how I did it, paired the same lenth rods together and adjusted one tower setting for that extra mm (DELTA_DIAGONAL_CORRECTION_C 1, default setting is 0).
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Wildcard
do not use solvent as you are more likely to erode the resin (polyester of epoxy) that is keeping the carbon fabric together. You can use heat, to a certain degree (200 F.), but the best option is to cut them off
The first time I didn't use a jig and rods came out all different length so I heated the printer head at around 80C and used it to heat and pull away traxxas screws from the rods, cleaned and glued them together again on a jig.