I can only speak to what the FCB/UNO can do.
First, communication with the FCB is one-way only. You cannot make the FCB do anything remotely (clyphx?).
As long as the Stomp buttons are sending toggling CCs, you can cause the LEDs to reflect their status by setting up the preset to send ON, OFF or NO CHANGE on preset load. For example:
Stomp 1 set to send, on preset load, ON (first value - 127) - the LED is ON, and the next time you press Stomp 1 it sends OFF (second value - 0).
This can be done for all 5 Stomps, and can be set separately for each preset. However, keep in mind that you'll be using the same 5 CC#s in every preset, you can't use different CC#s in different presets. Also, once you start configuring presets/stomps this way, all presets you're using need to be configured, else the LEDs won't change and nothing will be sent when a preset that's not configured is sent.
The attached ControlCenter sysex screenshot illustrates this:
If you load Preset 1 the Stomp LEDs will be On-Off-On-Off-On. The FCB will have sent 127-0-127-0-127.
If you then load Preset 2 the Stomp LEDs will be Off-On-Off-On-Off. The FCB will have sent 0-127-0-127-0.
If you then load Preset 3 the Stomp LEDs will remain Off-On-Off-On-Off, and NOTHING will have been sent (other than the PC#).
Again, LED syncing ONLY works with toggling CC#s.
Hope this helps.