What everyone else calls a 'Bb', brass players call a 'C'. While you can argue for this, it's confusing and annoying. I want to use the standard names for the notes from the beginning. I took the fingerings from this chart and converted them to concert pitch:

note	1st octave	2nd octave	3rd octave
E	1-2-3	2	2
F	1-3	0	0
F#	2-3	2-3	2-3
G	1-2	1-2	1-2
G#	1	1	1
A	2	2	2
Bb	0	0	0
B	1-2-3	1-2
C	1-3	1
C#	2-3	2
D	1-2	0
Eb	1	1

Now I can figure out the standard keys:

G/Em/Am/Dmix

note	1st octave	2nd octave	3rd octave
G	1-2	1-2	1-2
A	2	2	2
B	1-2-3	1-2
C	1-3	1
D	1-2	0
E	2	2
F#	2-3	2-3

D/Bm/Em/Amix

note	1st octave	2nd octave	3rd octave
D		1-2	0
E		2	2
F#		2-3	2-3
G	1-2	1-2	1-2
A	2	2	2
B	1-2-3	1-2
C#	2-3	2

A/F#m/Bm/Emix

note	1st octave	2nd octave	3rd octave
A	2	2	2
B	1-2-3	1-2
C#	2-3	2
D	1-2	0
E	2	2
F#	2-3	2-3
G#	1	1

Update 2014-01-18: I've now been playing trumpet for a year and a half, and thinking of the notes in concert pitch has worked out well for me. While the fingerings were initially strange they were going to be strange playing contra dance music regardless, and the hard part is the lips anyway. Sometimes before I start an activity I have weird ideas about how the people already doing that activity should be doing something differently, and often I'm wrong, but this is a case where looking back doing it the standard way would have been much harder.