I did not have / check sich a setup.
But I think this could be achieved by integrating an ADI-2 Pro FS R BE into the system, which has a SRC built-in.
Maybe cross-check this with RME... as I am not sure at the moment whether the SRC happens in both direction.
From Reverb to ADI-2 Pro and vice versa.
SRC can be set to either AES or SPDIF In.
So I think this should be possible:
UFX II --- AES --- ADI-2 Pro ---(SRC)--- SPDIF --- Reverb
Check e.g. ch 8.6
https://www.rme-audio.de/downloads/adi2profsr_d.pdf
https://www.rme-audio.de/downloads/adi2profsr_e.pdf
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13