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!
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)