The Mac/Venture boats are light boats with light rigs. There are several places one can use "dingy" rated items.
With a furling system, I always look at the suggested forestay size as a guideline. There would be no point in adding a furling drum, made for 5/32 and larger forestay when your forestay is 1/8.
Just my humble opinion
Remember also, this type of furling is only for taking in the sail completely, or letting it out completely. They are not designed for partially reefing the sail. Trying to sail with a partially rolled up headsail on this type of furler, does two things.
1. you lose your sail shape quickly.
2. (and more importantly) the hanks will end up tearing through, and/or wearing the sail cloth, where it is rolled around them if the rest of the sail is loaded.
I've pondered buying one of these units for years. There have been two times when I really wished I had one installed on the jib. When single handing, and a gale comes up suddenly, it can be very difficult to leave the cockpit and go take down a headsail. It would be nice just to roll the sail up on the forestay. I almost got toss off the boat, one time.
I have almost decided against this furling gear and just make up a downhaul for the headsail, led back to the cockpit.
I saw a couple designs that pull down, and bundle the sail up by the forestay. I keep meaning to try this.
I had the CDI furling on my X boat. I liked it, for the most part, except when rigging and unrigging the boat. I also found that it would often hang up or give some kind of trouble, when I needed it most (gale situations). So this is why I've opted to keep the rig on my D boat, as simple as possible. I've found changing headsails to be easy and I can do it quickly. So, except for the worst situations, I now prefer hank on headsails........... on a small boat like this anyway.
Just my thoughts on all of this............. for what they are worth.