I tried to contact the organizer contact by phone, but didn't get a response. I did receive an email and it said we were "registered." I would like to talk to someone at least on the phone before getting into something like this.
Having one or two H33s accompanying us isn't what I call safety. Hull speed of like 8 knots will take a long time to get to anyone in peril.
I do think the boats should be similar so we can stay somewhat 'together.' Of course, a well maintained TheMightyHobie18 can make it, but they would likey be way behind the main pack, and if the safety boat follows the last boat, then they won't be anywhere near the 'bunch' to help, especially if the spinnakers pop out.
EPIRBs, SAT phone, multiple GPSs, glow sticks, reflective tape, VHF, backlit compass, flashlights, plenty of spare parts, and even a radar reflecter might be a good idea.