Er collets are an option. You can find plates to build chucks out of or taper collet holders to slip in the tailstock, headstock, ect… I have them for head and tailstocks of 2 lathes and r8 for the mill. I have a plate style chuck for my 12x36 and my rotary table. I have hex and square collet blocks for quick indexing. They all take the one set of er collets. The one place I know they don't beat something like taper collets is with a nice collet closer. It is slower to use er collets and requires tools. I bought a metric set as at the time it was the way to get collets that covered the entire range from smallest to largest with no gaps. Each collet covered 1mm and they are graduated in 1mm increments. They were all around more affordable than the mt taper collets I was finding. I throw this out as something to consider. I don't have a source for metric mt collets. Good luck however you decide to go.