I have tried the IMS toolchanger. If you are cutting foams or soft wood, maybe it works. It did not work for me and the tool holder spun in the holder. Calling IMS< I was told the spring pressure was too low. I had to buy a new spring. Though it did hold tighter, it still slipped and when the tool slips it breaks. In my research I did come across this link, USOVO.de - Werkzeugwechsel Spindel fr Sherline 5000er
This looks like the best system I have seen so far besides Joe Vicars system which is no longer made (some parts are available but not all).
I have a Dyna 2400 and it was available with ER16 quick change tool holders. Looks like a baby cat 30/40? the retention nut when unscrewed pulls the tool holder out. Works very well but no tool holders are available. It would not work for automatic changes but works very well for quick changes with no use of a drawbar or hammer to remove tools.