Hah, welcome to the G0602! Yes, this is a common problem and one I think is just dumb. It took a rather significant effort for me to remove the chuck. I ended up using a 5/16" drill rod and a stack of shim supported by wood over the ways to stop the spindle against with the drill rod parallel to the shim stack. That shim should butt up as close as possible to the spindle so the drill rod can't bend or shoot shim at you. Then I used a large wrench over one jaw to give me some leverage and put my weight into it. Protect the ways from the wrench because it will be easy to hit when the chuck finally breaks loose. 20/20 hindsight I would use a long wooden lever in the jaws rather than risk damage with the wrench. Worked ok for me though.
The factory instructions were not going to get it done. I too had bent chuck keys and also had the spanner holes start wallowing out and it had not budged till I came up with this.
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CNC: Making incorrect parts and breaking stuff, faster and with greater precision.