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I would try using baking soda first. It will take the paint right off and won't harm the glass or rubber trim.
If there are parts that have something deeper than surface rust or an undercoating for that matter you might have to use something more aggressive. I use coal slag but it removes a bit of metal and actually etches it. For my purpose - powdercoating, that's preferred. Don't know how your painter would feel about it.
Plus baking soda is water soluble, so you can just rinse it out of the car and your garage. It will be messy though. Powder will get everywhere. Make sure you wear a good respirator\mask.
Does HF make a bigger unit? You don't want to spend your time refilling that thing every 10 minutes.
Try a pool store for the baking soda (sodium bicarb) that's the cheapest I got it. Might be cheaper down in FL. Also Sam's club sometimes has 12lb boxes for $4. Works out slightly cheaper than the pool store near me.
Good luck and be sure to post your process\progress!
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