I ended up (after much research) having my friend build a pad that provides 26.7 decibels of attenuation. The Nagra output is much too hot for the zoom... so "internet human" maybe you shouldn't be snarky unless you know what you are talking about? @Internet Oh and transferring to the zoom (that I am "stuck with") works perfectly now.
I don't think the quality will suffer, when they're digital atleast you can readily access them.
But there isn't a true line level input on the Zoom H1 so you may find you clip, try lowering the level on the H1 first considerably gage it from there where you'll need to be 6db 12db etc/.
The H1 is a great little unit, nice and light, durable (abs plastic) ...