The idea is interesting but a couple issues come to mind.
The heater requires a lot of current compared to the other connections. Placing the heater connector in the same wire connection with the other wires means you need a large current connector and also wire that can handle the amount of current and insulation to match. The connections also need to be very tight for the heater as the higher current with loose plugs results in extra heat on the connectors which is a common failure point on ramps boards.
A better idea would be to place the heater connector on its own and leave the rest of the wires on a main connector.