I use Master lock Street Cuffs to lock the steering wheel to the frame - they are available on Amazon for about $33 - Street Cuffs
I do something very similar but, just a different product.
My concern with the street cuffs was that the steering wheel can be cut in one place quickly.
This lock can loop through the steering wheel, requiring at least 3 cuts of the steering wheel.
If someone is skilled and determined, neither will stop them. A battery angle grinder will cut through either in short order.
Still looking at options to interrupt the starter button and require a proximity key or perhaps a keypad code.