Back to rig thinking..
There is maybe another option, without the split rig.
As drawn the sail has ca. 15% balance with the 70 degree yard angle and a lead CLR-CE of 15% ( that’s where the mizzen comes in the picture..)
Now.. if we decrease the lead to 10% and increase the balance to 20 % with a yard angle of say, 65 degrees, then the mast can move aft by ca. 90 cm, just aft of bulkhead 8, putting the bunk forward of that.
With plenty of drift between slingpoint and masthead there will be room to fiddle.
We keep the mizzen.
I’ve discussed this option now with Chris Morejohn and he likes the idea.
Feel free to come with input.