While it is important to get your feet in the right place, it is more important to align your shoulders in the right place. If you look at some of Terry's videos, you will see him maintaining proper shoulder alignment with his feet in many different positions.
I think getting your feet in the right place is more important in golf than it is in archery. In archery, if you are standing open to the target or square to the target, you should be able to rotate your torso such that your shoulders are perpendicular to the target. The only limitation is how much range of motion you have in your torso. It is a little more difficult to get your shoulders in proper alignment if you're standing closed to the target, but even that can be done as long as you can draw the bow without interference.
Granted, for target archery, you should establish an ideal stance and use that every time, but for hunting or many 3D tournaments, you have to shoot from whatever stance you have available to you.
If it is important for you to stand the same way every time you shoot, you can probably figure something out. For example, the range of motion in my neck is such that if I stand in a neutral position and then rotate my head as far as it will go in the direction of the target, if I can just see the target with my dominant eye, that means that I'm pretty much perpendicular to the target. Or, you can use the old trick of placing an arrow on the ground touching your toes and stand back and see where it's pointing. Eventually you'll get used to lining up in a certain way that should be repeatable.