You can always re-mill it. I run my grains through twice. Since it looks like you do smaller batches you could probably use a blender, food processor or coffee grinder. It's very hard to go too fine for BIAB. Long term I still recommend getting a mill. I feel like it's already been worth the investment for me. Keep in mind too that malt typically keep a lot longer when it's not milled so you can buy it in larger quantities and save more money.