Richard,
What you really have here are 2 different benefits. One is taxable, one is not. If you approach it with that in mind, you can see the solution is simple. The system needs a way to know how much is taxable and goes in wages (and therefore in Box 1), you can also enter Box 14 in the benefit screen and put the wages in another box with an appropriate notation. The fact that it is subject to Fed tax automatically gets it in box 1.
The amount that is a nontaxable benefit needs to be set up separately. It's not subject to Fed tax, so it won't go in box 1. If you want it in a box, put that on the benefit setup screen in the W-2 box fields.
Kind regards,
Leslie