Refuse to read the whole thread, but here is my input anyway
Those PWC's will tow OK if you use a bridle. Obviously plaining speed will depend on weight and sea state.
Amazes me that folks venture off shore in a single engine anything, or further offshore than I could swim. Twin motors for peace of mind, which precludes PWC's as far as I know.
Hard bottom inflatable with twin 50hp out boards, and carry everything you need with you. They can get expensive, but I would run a RIB over anything else mentioned. But, they suck in any sea state over a couple feet. When I ran charter yachts in the islands, I would use the RIB as a sports car / SUV / water taxi / dive boat. And I had the ferry schedules memorized, so if I needed to make a quick trip to St Thomas to pick up mail, I would "catch" the ferry boat and ride in the wake, or play on the wake, the whole trip - visit in St Thomas, and then catch one of the ferries back to St John or the BVI. Plus it provided entertainment to tourists on the ferry as Captain Ron played in the wake, or towed a buddy on a wake board in the ferry wake so he could catch the endless 4' break thrown by the ferry wake
Damn we had fun.