Sorry Dan, my comments were in response to Guapa, not you. I certainly would try a DIY fix and on my rig probably without dropping the mast using the spinny halliard. However, Guapa's a bit bigger so care will be needed lowering the roller gear.
Guapa - silence from me on cost because I can't find my invoice for the new rigging for the cap shrouds but looking at this
plus some new Staylocks as a pricing example, I guess you are going to spend £200 on parts. Main problem is your distance from the boat and a source of new stuff - can't remember if there is a place at Levington. Needs some careful measuring.