How about a reflex viewer for the back. Seems like the number of steps to make a photograph would be the same.
Compare:
YOUR SLR:
1) focus compose
2) close shutter
3) set aperture
4) remove darkslide
5) lift mirror
6) expose
CONVENTIONAL REFLEX VIEWER:
1) focus compose
2) close shutter
3) set aperture
4) insert film holder
5) remove darkslide
6) expose
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