Hi Barry,

I asked the same question here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=9781.7

Michael added a function Sept 10-2020 Moi V4 beta to move the seam point.

Ref:
http://moi3d.com/wiki/V4Beta
Sep-10-2020
Scripts:
Add curve.changeClosedCurveSeam( new_start_parameter, rebuild_circles /*optional, default = true */ );

I have not had the chance to test it.

Wayne