AFP HHA3385RS Full Brim Hard Hat Replacement Ratchet Suspension | 6 Point Attachment | Standard Size | Plush Foam Moisture Wicking Sweat Band |OSHA & ANSI | Compatible with AFP Hard Hats Only

I'd recommend installing a hardhat suspension rig. You can get chin straps that link into the suspension rig framing. You might need to install some bracing to mount the rig to but you're already talking about doing that. Additionally, using a suspension rig would allow you to eliminate most if not all of the foam. Your head, neck & upper back will thank you. (Source: I wore combat helmets, welding hoods & hard hats 90% off my adult & adolescent life)