If you know anyone who is a machinist, you can have any 223 bolt (.380") opened up to .420" bolt face.
I am not overly impressed with the 224 Valkyrie. I built a Remington Model 7 in 224 Valkyrie for a customer. He was going on about how it's faster than a 22-250 (it's not, according to my chronograph), how it's more accurate than a 223 (again, not according to tests), and how it has the ideal case volume for 22-caliber bullets (whatever that means). He bought into the heavy hype when the cartridge was introduced. It shot well, launched 69 gr SMKs at 3200 fps (not bad but not super fast). I think it's an AR-specific round, designed to give a little more velocity than a 223/5.56 within the 2.230" OAL limitation. I don't know that I would go out of my way to build a bolt rifle in 224 V, I already have a 22-250 that launches 50 gr V-Max at about 4,000 fps into 1/4"-3/8", so I have velocity and accuracy covered. But, hey, go for it. It's no different than guys who built 22PPCs 20 years ago. It's an odd bolt face size, but that's only an issue if you decide to do something else with it.