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Nice try. I did once Betelgeuse with my (former) 25cm Dobson and the Canon behind it and eyepiece projection with a Baader grating filter in it. I put the grating lines parallel to the motion so a 30 sec. exposure would stretch spectral lines, so no tracking is required.
I think a 4th mag star like eta Carinae is too faint and that star is so hot (class B or O ?) it does not produce easily visible spectral lines, just a continuous spectrum with faint lines. Alpha Centauri might be a better sample: same spectrum as the Sun and bright.
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