Extended Universal Tools Holder, you can buy as many of them as you need, depending on how many different hotends you have to swap.  It can mount Chimera, Water cooled heatsinks, and many other models.
It is longer than the regular Universal Tools Holder, just in case you need to fit  some shorter heatsink system that cannot reach the calibration die setup.

To fit this you need 1 of M3 bolt long 15 mm and 3 M3 bolts long as per your measurment plus 2 nylock nuts. You also need washers, a 2mm drill bit to drill the main adapter at the corresponding hole in the piece holder, and an M3 tap to tap said hole you made in the Main Holder, just to lock in place the piece adapters there.

To fit the heatsink, slide ther Main Holder onto the Calibration die holder, lock it with a bolt to the calibration die holder, fit the assembled geatsink plus hotend and nozzle in position such that the tip of the nozzle beary touches the calibration base lip, than carefully mark your references for the holes to be drilled in the universalt tool holder, unscrew the calibration locking bolt, remove the holder and mark the holes position, drill through, fit the heatsink and is ready to be placed on your printer.

For the price you have one  Universal Tool Holder.   You need to buy the M3 nuts and bolts.

Word of advice from experience, PLA will fail in time due to proximity of hot elements like heated bed or the hotend, but can print in an open printer frame over 100 hours before it fails sometimes.

If you intend to run your printer on the hot side of polymers do not go for PLA, rather nylon, or PPS or similar, if you intend to go fully enclosed and really hot polymers in printing, I reccomend you go PEI or PEKK.