Selling single ASIN in multipacks?

I have a listing where I’ve been packing and labelling two items together. This allows me to sell twice us much as I normally would. However, repacking individual items into pairs takes time, and I’ve realized I’m missing a small amount of sales where people would prefer to buy a single item. I also want to sell a single item paired with a completely different product in a Virtual Bundle.

Is it possible for me to send my inventory to FBA packed individual as single items, then create a listing for 1 item, and a second listing for 2 items? How can I ensure Amazon will pick 2 items off the shelf and ship it together?

My goal here is to just send items to FBA in their most atomic form, then create different ASINS for multipacks and virtual bundles.