Hi Mike,
Thank you very much for your kind words. Unfortunately at this moment this is not possible. Usually I suggest a modification or a custom code if possible, but in this case I can’t. Because the redirection and the URL of redirection is sent as an argument during the initialization process, it’s not possible to alter it afterwards.
I’m preparing a release of 4.11.7 later this week. One thing I can do is to perhaps implement first the custom field part to work as you described. So anything within the {} brackets that is not the {phrase} variable would be replaced with the custom field values. Taxonomy terms are a bit more complicated, but I will see what I can do about that.
I will try to push this feature into the next release, I have already placed it to the upcoming features list, it should not be too complicated, at least not the custom fields part.