There is not going to be any way to have the charge reduced to something else or for it not to appear on his record if he pleads guilty or is found guilty of the charge.
Since the Omnibus DWI Act of 1983 was passed and has been amended numerous times, there is little leeway for negotiating a DWI other than to try to have the Court impose mandatory minimums upon conviction. Other than that if you want something better you have to roll the dice and try to beat one on technical grounds or by being found not guilty, neither of which happens very often but of course each case is different.

