It''s hard to install a traveller, since you cannot just screw it into the fiberglass.
It is not hard to install a boom vang, since both ends are attached to aluminum spars. All you need is a rivet gun or tapping screws and knowledge of what you should do about "dissimilar metals" (search the articles).
Many sailboats have travellers so short that they are nearly worthless. Mine is only 2 feet across, on a 34-foot boat. So, I use the vang to pull down the boom, even close-hauled, and the sheet to control the angle of the sail wrt the wind.
The only thing I use my little traveller for is to pull in the boom that last 12 inches to the centerline in light air.
So, if you''re really concerned about this, consider installing a vang with a cam cleat. Don''t worry about the traveller.