What do you recommend for a non-alcoholic Substitute

The bourbon was only 2 tbsp - I’d use brown sugar, molasses or caramel sauce for one tbsp (to replace the bourbon flavor notes) and broth or fruit juice for the other tbsp (for liquid).

I recommend apple cider vinegar with a splash of either vanilla extract or almond extract.

Just omit. I don't think it's worth shopping for a substitute ingredient for what would likely be a one-off replacement case. Then you'll be stuck with something that you don't use on a regular basis.