You can find reasonably cheap Soviet 35mm viewfinders, and the fairly inexpensive VIOOH/IMARECT zooms from 35-135, with a stop for 90mm so you would be covered for all of the lenses.

I do not have first hand experience dealing with her, but Sherry has been used by a couple of my Leica-owner friends and they have been very happy. Maybe send the whole kit to her for cleaning/adjusting so she can verify that everything works together as it should?

Lastly, burn some film! Slides, some slow black and white, high-speed black and white would be my first recommendations.