You can buy sandblasters on Amazon for pretty cheap if you already have a decent compressor. There's also this:

Wagner Spraytech 0513040 PaintEater Electric Palm Grip Paint Removal Sanding Kit, Orbital Disc Sander https://www.amazon.com/dp/B000FFYLJQ/ref=cm_sw_r_cp_api_i_ZMYX6PGTH0E8HW6WFM15

If you already have an angle grinder you can buy those same discs at harbor freight and have pretty much the same setup