My Beneteau First 38 also has an Isomat mast, and a previous owner went with a Schaefer furler, and they installed a restrainer in the form of a large bail bolted through the center of the mast that keeps all the halyards near the mast for about six inches below the blocks. My I/J is much more acute than yours, and without the bail, the lead to the furler is very negative, so removing it didn't seem to be an option.
I don't particularly like the look of the approach, but since I don't have a real spinnaker block on a crane, the restrainer also lets me fly a chute with a jib halyard (not wire) without worrying about chafe due to entering the masthead block at the wrong angle, since all three jib halyards are under the restrainer. It does induce a little friction in the hoisting and shortens the max luff of the genoa nearly a foot, but since I'm not racing, I can live without the minor sail area difference.
When I bought the boat, the furler was very stiff, and Schaefer gave me a very nice price on a new lower bearing since they had re-designed it to eliminate an engineering problem.
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