Ha - quite. I know the hipster spectrum goes bike packing > front rack > rear rack but my fork doesn't take a rack and I need to carry a tent around so bike packing is out.
Full frame bag or saddle bag ( what ever style you prefer Restrap/ PDW / carradice), you could just use a Carradice support and strap it on that in its bag.
If you must use a rear rack get Tubus with the disc adaptors, or even a disc specific one.
Rear racks are not hipster approved unfortunately, but I'm sure there is a forum approved one.