OK, late jumping in on this, but here's my .02 nuyen. Under the rules, there are three ways you can include wands without any houseruling whatsoever. First, they would make a nice power or centering focus, depending on tradition. Second, a Geas forcing them to use a wand or suffer a penalty to their rolls is perfectly acceptable for many traditions. Third, using a wand as the lynchpin for alchemical preparations.
Well, there's actually a fourth, though it gets away from spellcasting. A mage of a Possession Tradition could have a wand as a prepared vessel, allowing them to easily fill it with a spirit and unleash the spirit's powers. A mage with an Ally Spirit could have their spirit have the relatively innocuous form of a wand, for any number of reasons.
Of course, if they introduced Spell Matrices from Earthdawn, then a wand would make an excellent way to hold the physical matrix of a spell, allowing you to 'channel' through it to use the included spell.