For the grains to have the enzymes needed to convert starches to sugars the grain needs to be malted. However, one would seldom use just wheat in a beer recipe and malted barley has sufficient enzymes to convert the starches of other grains up to about half its weight. With that in mind, you could make a beer with half pale malt barley and half unmalted wheat. Be aware that using that much wheat in a conventional mash tun risks having difficulty in draining the tun because the husks form the filter in most beers and wheat has no husk. Using a different filter medium like a brew bag or paint strainer bag will solve this problem by providing the filter with a large area and if it causes problems draining, just lifting the bag will provide new filter area.
