@meeotch I think the splitter you got linked from support is the right kind, despite the text that says 'only use one ... at the time'. It seems to be a passive type that splits light with a prism so it is worth trying - if you have a Toslink output you can use.. Both output ports should work simultaneously, but the strength of the light is probably a bit weaker due to splitting.
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Devialetless!
Roon, ROCK/Audiolense XO/Music on NAS/EtherRegen/RoPieee/USPCB/ISORegen/USPCB/Sound Devices USBPre2/Tannoy GOLD 8
250 Pro CI, MicroRendu(1.4), Mutec MC-3+USB
Devialetless!
Roon, ROCK/Audiolense XO/Music on NAS/EtherRegen/RoPieee/USPCB/ISORegen/USPCB/Sound Devices USBPre2/Tannoy GOLD 8
250 Pro CI, MicroRendu(1.4), Mutec MC-3+USB