Rictorn,
If you are going to use a jib on this craft you have two options that will maximise the chances of success.

First and the simplest is a bridle foil and a single forestay.

Second is to take the decks off and put in a subdeck and still use a single forestay.

If you decide to not use a jib you won't have to be concerned about how a jib would set on your boat so
you could use dual forestays maybe from the bridle
fittings.

Regards,
Phill