G/C clamp is all you need.
Before you start clamping down on the tire, stick a tire iron onto either side of the tire. Clamp down on the tire irons with the G/C clamp...and the bead will break.
Also, if you aren't sure your spoked rim is tubeless, check the bottom of the rim to see if the spokes come out. The spokes would be L shaped.
HTH
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