you can't bodydrop it, but 24s yes. Look at the tacoma layed on 24s, but you may have to change the front suspension to an s10 to get rid of the i beams... idk
i would say yes you can. a 255/30/24 is 30" tall, which is just barely taller than a 255/35/22. so as long as you dont run into clearance problems between the hood and the tire, i dont see why not...