Depending on the furler
most of this should not be difficult. If the sheaves are very narrow and intended only for wire then converting to line
may require new sheaves.
If at present you have rope/wire halyards and the rope section passes over the sheaves now, then simply replace them with low stretch line
and you're done.
As long as the furler
is not one of those that 'replace' the forestay, but rather install around it then all you need do is support the mast, slacken and release the forestay, disassemble the furler
and remove it, and reconnect the forestay. By all means engage a rigger for this if you're not comfortable doing it yourself.
Sorry, I'm a long way from CA and can't help you with local riggers, but I expect someone here will know.. good luck!