If you do not get on with bootlace ferrules, use pin crimps from a decent supplier like TE-Connectivity (used to the AMP). Note there are lots of suppliers who provide woefully inadequate versions, the same applies to the crimp tools. If you buy the cheap ones you will probably get an equally poor result.
You can buy from Farnell and other good suppliers.
The pins as shown below may work but it will depend on the geometry of the MK MCBs. If you want to put multiple wires in a single termination use the flat blade type and put them back to back. There are multiple versions of these crimps some with longer pins, but these may be harder to locate a source.