I have rigged the trysail at the dock/anchorage a couple of times to the end of the boom and the cut of the sail looks ok. I will try rigging it to the quarter and see what it looksl like. My guess would be that it it cut to be used with clew to boom but I will see. The boat has a separate trysail track and dedicated halyard so that part is fine. Have to do some experimenting and I probably should try it some time when it pipes up a bit (35 knots say) just to figure out things like how high up the track it should go and what the shape is like overall.
Thanks all for the advice.
Heading back to Lake Ontario for this summer. Ainia is back in North America for the first time since 2010. Currently in Long Island Sound.