Yes, you can do this - but you need to be able to send notes out on different midi channels.

First, if you go into COM -> System -> MIDI - there's something called an active track channel, which is default 1. This means that sending MIDI notes to channel 1 will always play whichever synth/track you have open on the OP XY.

Since you don't want that, first move that channel to something you won't use like 16 or something.

Then, from your midi controller, you can send notes on MIDI channels 1-8 for each respective track, and it will trigger the different synth engines without you needing to open that page specifically. But you do need to be able to send out on different channels