How do I enable USB boot after deleting my recovery partition?

I did a rather careless thing while in disk recovery (I was wiping a MacBook Pro 2018 for re-use) and I accidentally deleted the root volume, which means everything. Because I don't have a recovery partition, I can't get the network recovery console to reinstall. And because I didn't enable booting via USB before doing this, I can't even get a bootable installer to work. What options do I have here that don't involve a trip to the Apple store and lightening of my wallet, if any?