One solution is to run the inner stay in place with enough tail to stow it at the shrouds.
The line across the
deck clears the forward
hatch.
Slightly ease the runners, check stays also slacken.
Tension the check stays with the twing.
Tension the inner forestay.
Crank on the runners & check stays.
A small winch just forward of the
hatch can provide enough
purchase to drag the inner stay with a hanked on sail across the
deck.
With
halyard and
sheets already attached the operation can be handled without going on deck.
I had fears of creating an inversion condition during deployment.
It appears those fears were unfounded