Avons may have been a good choice 30-40 years ago and may serve well today, but there are other choices that, IMHO, are better, especially if you are willing to lace an 18" rim to your rear axel. I use BT 45 Bridgestones (110/90/18 rear, 100/90/19 front) and have no trouble wearing out the outer soles of my shoes going around corners, I also have my ISOs set tight.
Given that a good rubber set might last 2-4 years you'll have plenty of opportunity to feel other brands; TT100s are at the bottom of my list, but I have had good experience with Dunlop GT 501s on my W-650. I'm thinking that serious ZR rated radials would be wasted on a Commando, lest it be as commited track machine.
RS