That guitar would really benefit from a set of Dunlop Straplocks and a dedicated strap. You could also counterwieght the lower buot of the body with a few nickels taped together and the taped in the cavity. Sounds wierd but 3-5 do the trick. That and the straplocks it will be simple to do.
All it takes to play is to ask. So I'll ask first. Would you play Dont Belive A Word by Thin Lizzy next year? TommyG , played Highway Star with you, would be the other guitar.