I'm not totally a fan of how they make some of their blades, but these guys do have a lot of experience regarding rudders, regardless. http://www.fastcomposites.ca/site/marine/
Their experience being on a multiplicity of boat & foil designs, over a decent span of time.
It'd probably be smart on your part, to get on the coconut telegraph (word of mouth, plus the internet). And see what you can scare up in terms of spec's on the original rudder. Especially the shaft & internals. And also any & all info on; general weaknesses in the rudder proper, plus everything it's connected to.
It'd be wise too, to measure everything that you can on your boat that's rudder related... with a micrometer, AND checking to see what's still reasonably round, & what's out of spec, in terms of being circumferential.
Needs be, you can buy micrometer type gauges for this as well. And neither type of gauge needs to be real pricey.
Also, now'd be a good time to see what else in your steering
system bears replacing & or upgrading. Perhaps even including going to a whole new shaft diameter & setup, along with new & better bearings. Plus, possibly re-engineering how the rudder & shaft are affixed to the boat. Including laminate reinforcements @ skin fittings, & post tubes etc.
Specifically, as to whether you might want to alter or reinforce the afore mentioned items now too. Including; simplifying the how behind bearing seats, bearing & rudder retention systems, & the steps involved in bearingl changes, when such task comes up on the maintenance
And a lot of the above (meaning my whole, text, info dump) is, in most cases, heavily determined by the failure mode of your rudder, & failures of any other components in your steering
system as well.
That, plus, looking upon now as an opportunity to engineer/build out the common weaknesses in the design of the steering gear
on that make & model of boat. For example; better shaft alloys, or going to a foil shape that'll give you better control for less effort. One that's more stall resistant, reduces/removes anything but fingertip level weather helm
So, I suppose that all of those considerations make it doubly(+) important to reach out to owner's associations, & the whole coconut telegraph thing on this. That, & to look for recommendations on any engineers of quality who don't have an overwhelming project
load on their desk(s) right now.
Good luck, & if you get real stuck, LMK & I'll see what else I can dig up. As making rudders ain't rocket science.