I personally would try these things.
Decalcify the stones: 1 gram of EDTA disodium chelate with 8oz of water on an empty stomach, followed 2/3 hours later with a multimineral supplement. High-dose vitamin K2, also D3, taken with bile salts to ensure their absorption.
To soften the stones: Malic acid or magnesium malate and humic/fulvic acid daily. Also bitter herbs should work well, including gold coin grass, milk thisle, picroliv etc. Magnesium chloride is also a good idea.
To clean out the gallbladder with detergent: 3tbl of non-gmo soy lecithin, 2g of taurine and glycine in 8oz daily.
To keep the gallbladder in top shape, TMG, ALA, NAC.
The next step is likely the traditional flush with lemon/oil/Epsom salt/ornithine.