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Basically yes.
With the 70/30 available options (there's currently no 80/20 on the market so it was my "wish list"), from memory about 3-4 sec guide integration for about 9mag. need to check my notes.
You may be correct about the pellicle - I have no long term experience...
Re the NIR v's stars....
The early stars (OBAFGK) emit predominatly from the UV into the green.
The later stars (MRN, carbon etc) peak from the red into the NIR.
As long as we can hold the maximum amount of starlight in a 20 micron slit, for as long as possible - spectroscopy is happy.
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