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@hoefla
^^ I'm sure others on here have more expertise than me, but first thoughts:
Pinhole exposures - easiest to calculate the equivalent of Sunny16 and then just guess either side, as the times are long anyway. however this won't be consistent enough for slide film. If you want to use a light meter, the cheap old-fashioned sort that have a dial and needle are quite good as you can just mark additional increments on them up to your required f-stop. Or if you have a digital light meter already that you want to use, write down the calculation you need to do on a label and stick it on as a reminder (eg. the exposure for f16 x 8 will get you to f128-ish).
Focal length - can you not set it up to focus on a sheet of tracing paper (use a lupe/magnifying glass too), then you know how far to put it from the film?