Subway - Probably should skip Subway if you can. The buns and wraps are all high in carbs. I guess you could just have them throw the ingredients in a wrapper sans bun, but that doesn't sound appealing. I have no info on what the carb count Keto Extreme would be for each bunless sub, but you can probably figure it out - chicken or pepperoni is fine, but is "sweet onion" chicken okay? No idea. Stick to the salads, but realize you'll only get iceberg lettuce (4g).
https://supplementgear.com/keto-extreme/