I'll third spatchcocking instead of beer can. A good-sized spatchcocked chicken will be done in about 45 minutes. That said, for space reasons, or to impress guests, I will sometimes still do beer can chickens. I've never had an issue fitting one on the 22.5" OTG. If it is a problem for you, bank coals on either side and put the chicken in the middle of the grill where the dome has the highest clearance.
22" OTG; 22" Performer; mini-WSM; Brinkmann gasser; UDS (on the way); Maverick ET-732