Mike, I would disagree with those who say you can't do well with a non athletic pg, but he better be an elite guy in all the core pg skills. On my DIII team, I ran M2M and had a pg who had bad ATH and DEF. I mean like 10 Ath and 20 Def, but he was in the High 80's - 90's in Spd, Per, BH, and Pass. Despite the low defense, he was my starter and got me within a few points of winning the title his senior year. You may have to move him on defense for bad matchups or double team. It's not the ideal player, but they can be very useful if used right.
The alternative option is to make him a career backup. Chances are he will face lesser guys which will make the Ath less of an issue, and his scoring opportunities are amplified against weaker defenders.