However, if you open the channel settings window for the track you can find the send FX target in the ‘Search Channels’ menu at top left of the window. Select the FX channel from the ‘Targets’ sub menu. There are also helpful arrows at the top left of the channel settings window allowing you to go back and forth between the last edited channels.
In the mixer, if you hold ‘alt’ (on Windows) and double click on the send-level, you’ll open the first insert on the fx channel in question. Not exactly what you’re asking for, but could be useful nevertheless …
… actually - there is a key-command:
“Channel & Track Visibility” > “Agents: Show channels that are connected to the first selected channel”. You could assign a hotkey to this, and thus filter your mixer down to the channels relevant to the one you want to see. I’d probably make a macro instead, that saves the current visibility set and then triggers the Agent; thus you have a quick way back to where you came from.