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I did my lumix gx1 a couple of weeks ago. my choice was also one of cost, not wanting to splash on a dedicated astro camera before getting a proper mount.
I went for a fused silica filter replacement for full passing of uv and ir as I am into spectroscopy and want every damn photon, and have an all-reflective optical train (newtonian and no focal reducer or barlow) so no worries about achromatism.
removing one of the filters (the one closest to the sensor) on the lumix also requires scary scalpel work on the glue. but all good, works great and spectral range is now circa 365nm to past 740nm (1st and 2nd spectral orders are overlapping after 730nm so it's hard to tell how far it goes. i need to use a low pass filter to see how far into the IR it does go.
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