It will work.
But one comment, you always say "to better sync".
Word Clock is not better or superior compared to clocking via ADAT or another digital port.
If I remember right then somewhere in this forum has been mentioned, that the Word Clock implementation of the Behringer Unit is not that good (maybe because of the low price and the components being used in it).
As WC in general terms brings not better clocking quality, you are IMHO better of, to use WC only there, where required.
In your case I would connect it like this
UFX - ADAT1 <------------------------ Behringer
- ADAT1 -------------------------> Behringer (getting clock from ADAT)
- WC OUT -----------------------> WC IN - UA4-710D (75 Ohm term ON)
UFX 75 Ohm term activated
UFX clock source internal
You need no external 75 Ohm plugs and no BNC Ange T connection in this scenario, simply the 75 Ohm WC cabling like this here: https://www.thomann.de/de/sommer_cable_ … ohm_5m.htm
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13