Heat grill to medium-high. Heat oil and garlic in small saucepan on medium until fragrant, 30 secs. Add mustards, vinegar, brown sugar, honey hot sauce and Worcestershire sauce and whisk to combine. Simmer, stirring occasionally, until thickened, about 3mins.; remove from heat (you should have about 3/4 cup).
Season pork with 2 tsp each salt and pepper and grill, covered, turning occasionally, 12 mins. Continue grilling, basting with ¼ cup sauce, until instant-read thermometer registers 63°C , 3 to 6 mins. more. Transfer Pork to cutting board and let rest at least 5 mins. before thinly slicing.
Drizzle bottom pieces of rolls with 1/2 Tbsp sauce each, then make sandwiches with lettuce, peppers and pork. Drizzle with remaining sauce and add tops to make sandwiches.