Yeh you can vent your catch can breather into the exhaust via a 1 way check valve. So back fires wont pressurise your catch can and engine. The fitting needs to be welded at a angle similiar to how you would merge a wastegate outlet to your exhaust. The exhaust flow rushing past creates a vacuum and that opens the 1 way valve and draws any oil/air into your exhaust....However having alot of oil in the can will only lead to copious oil fumes. Only good if you have the oil control sorted and it alleviates the need for air filters on the can.
Best setup is individual lines from cam covers to can and a crankcase vent from inlet side of sump to can and a return from can to exhaust side sump. The way the crank spins, it creates a vacuum on the exhaust side encouraging oil drain (oil return holes are on this side) and return from the head, while the inlet side is what vents the crankcase of blowby pressure. The direction of flow is the same as the crank's clockwise rotation. Similiar principle to windage. Its why crankscrapers always face the crank at a tangent to its swinging arc, from the inlet side. Or why the louvers on windage trays are bent up towards the exhaust side.
Hopefully this will help.
Please excuse my lame paint skills.