Maugan, like the boat or not you would be doing yourself a dis-service by not wanting to enter the event due to the choice of boat.
If you and Trey are really built to be a cross between basketball players and football players, I`d suggest you split up for the event and both find small crew - advantage is they usually come in female form .
That way you both get to sail anyway, if as a combined crew you feel you might not fit under the boom or be too heavy to be competitive.
We sail smaller boats than F16 (no, really !) Big boats cost big money in SA. Some of our skippers are 90-108kg, and sail with their wives or kids. Have a look at the boom height on our boats, you will think the Blade has HUGE space after that.