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I see two problems with starting with a 1/2 inch shank. First is that you would have to buy an expensive holder because you need would need the accuracy. Second, the holder would be way too long. If you want to make an adapter which fits in like the CT press on adapter, you really have to turn a holder down.
I'm not sure I follow you here. On mine I just turned down the tail end so it sit up in the recess on the CT. (the CT spindle necks down to around 3/8" up inside. That is not really needed though as it would be better to just cut it to length. Buy a stubby ER11 collet chuck with a 1/2" shank and cut off the tail end.