If I ran the zoo.........this is what I would do..
Install a pad eye outboard
of each cleat on the aft cockpit
combing. splice two dyneema
bridals to one large Antal ring, outside groove, at a height above the center of the cockpit
that works for the tiller. Splice a short bridal from the large antal ring, outside groove same as the other two bridals to a smaller Antal ring, outside groove, several inches above it. Make a third bridal/pendant splice to another large antal ring, outside groove, then to the boom sheeting point. Use a length of Double braid or what you preffer for sheeting in a endless sheet from one of the cockpit cleats
, say port for feeding, through the large antal ring, fore to aft, up through the antal ring on the boom pendant, fore to aft down though the smaller antal ring in the middle, up and through the antal ring from the boom pendant aft to fore, down through the lower antal ring, aft to fore to the stb cleat. No expensive blocks, you can trim from either side of the cockpit, super easy to play around with lengths to figure out the optimum bridal and pendant lengths, plenty of purchase
, and a easy arrangement to sweat and tuck.