YES, the factory forestay is strong enough to handle a small jib.
Just attach a small block to the forestay tang (underneath), add a length of line, and you have a halyard. Run it through a small block at the base of the mast and you can lead it back to the cockpit. You could even set a small jib "flying" (no hanks) like I did initially.
When the air is so light that the boat won't move, despite the skill gained with a gaff headed main'sl, you'll be raising a jib, preferably made of Nylon. OR, you'll put the sailboat back on the trailer and launch the powerboat!
IN LIGHT AIR - NYLON IS KING!