CooBigo 3pcs 1-1/2 Inch Plastic Buckle for Strap Replacment, Heavy Duty Belt Buckles Backpack Clips Luggage Webbing Straps Side Release Buckle Clasp

https://hdsunflower.com/us/accessories-pack-1.html <-- This maybe your best bet? it comes with Silicone one and fabric one and a pin for like $8. Alternatively you can cut a lanyard to fit your wrist and use a Buckle thing