Would suggest you go with a 380mm steering wheel as it is probably the ideal size. Have used a rare 370mm Nardi, a 380mm four spoke Alpina, and presently using a 380mm Petri wheel.
There are 2 types of signal cancellers used. One is the integral canceller that is attached to the mounting hub, such as the Momo hubs and the other is a small ring type that just press fit onto the bottom of the wheel. These were used on the original BMW, Nardi and the Petri wheels. Whether the steering wheel canceller mechanism is on the left or the right, it does not present a problem. With the Momo type, just unbolt it, and spin it 180 degrees and remount. With the ring type, just pull out, reposition and remount.
Below pics will show steering wheels personally used and their cancellers' fitment.
380mm wheel looks much larger due to the closeup shot
Momo hub as used on Alpinas, Momo and other after market wheels
Ring canceller as used on oem BMW, Nardi and Petri wheels