Been there, done that. I replaced the case fan and the hotend cooling fan with noctua NF-A4x10 5V - the maestro board allows you to jumper the fans to 5V. This significantly dropped the machine noise. No need to do so however from the start, the fans used by Creality are actually 24V models.
For the wiring of the display: this is the relevant thread where I posted an instruction to create an adapter cable
You should get new connectors with your maestro board, get yourself a proper crimping tool and just replace the JST plugs with the Würth ones - a bit annoying, but it is literally a one to one connection for everything but the end stops.