I purchased this one from Amazon for my mini pochette.

HAHIYO Purse Chain Strap Length 43.3” SPOT-ON Gold for Shoulder Cross Body Sling Purse Handbag Clutch Bag Replacement Strap Comfortable Flat 0.4” Wide Enough 2.4mm Extra Thick Metal Strap 1 Pack https://www.amazon.com/dp/B07RW9QVPQ/ref=cm_sw_r_cp_api_i_68WWWENZJ4YFWNKFQRTC?_encoding=UTF8&psc=1