I'm in a similar boat with my Belgian Golden Strong. I could keg it, but I'd like to put some in PET bottles too for a road trip/sharing with family. I have no fear of bursting; those bottles supposedly will take 80psi without too much trouble. I've used a carbonator cap for carbing up small batches in 2liter plastic bottles at 12-16psi without issue. I'd have to think you'll be closer to 12psi than you will be to 80psi.