Dave R wrote:omething to keep in mind is that almost all lagers are made with wheat.
Dave, your point is valid even if the details aren't quite right. Malted
barley is far and away the most common grain used in beer in general and that includes lager. Use of wheat in beers is actually fairly rare, enough so that when it happens you usually know it by the name of the beer; "wheat beer" or "hefeweizen", for examples. But the beer is still something you'd have to watch if trying to make this recipe gluten-free; barley also contains gluten. There are gluten-free beers in this world, easily Google-able. They seem to rely principally on sorghum.
Celia, I'm sure this recipe is what we'd call here a "quick" bread, depending on the baking powder in the SR flour, not the yeast in the beer. You couldn't depend on a lager to have active yeast, also note that the bread is baked immediately after kneading. No time for yeast to cause the loaf to rise, in other words.
I'm not much help on this, having no experience with baking gluten-free. The bulk of the ingredients here (the flour and the beer) both having gluten makes a tough starting place for gluten-free bread. It might be easier to start with a good gluten-free quick bread recipe (I understand those are rare enough), add a little sugar and substitute gluten-free beer for the liquid in the recipe.