Switch between AKAI MPC ONE and PC as main DAW (sequencer, clock)

[Jesse Johannesen]

I think you nailed the problem on the head, since there is only one Device port there is no way to swap between two ports unfortunately. If you still have that splitter, it may be worth testing it out, but I can't say whether it would work or not as I'm unfamiliar with the device. May be worth a try.
The RJ45 port on the MRCC isn't an ethernet port, it just uses the same plug. There's not a way to utilize RTP with the MRCC.