I converted my R33 part way. After looking at deck mounted and mast butt mounted lead blocks, I decided to slip a "mast plate" under the mast, which provides mounting holes all around the mast base. I led my main halyard, spinnaker halyard, topping lift, fore guy, boom vang, slab reefing (first reef only) lines, cunningham, and flattening reef through blocks fastened to this plate, then through Harken "deck organizers" to Garhauer clutches.
I left my three jib halyards on the mast, since as a frequent racer, I wanted to get some people out of the cockpit during sail changes. Having a twinstay, someone needs to go forward to deal with the headsail anyway.
I ordered the recommended rope equivalent to my current wire halyards, but I was disappointed in how big they were, so I decided to stick with the wire halyards until they self-destruct. They all have rope tails, so they don't require wire winches and hard hard on the hands.
The main problem you might have with the conversion is your masthead turning blocks might be designed for wire, with small diameter grooves in the block, which will wear the rope halyard really badly. You'll have to climb the mast an take a peek (or maybe a good pair of binoculars).
