Considering that most uses for TOS/Link happen to involve a Dolby AC-3 signal, I don't forsee any makers giving you that option.
Truthfully, the only place I've seen any kind of amplifier with digital-in without surround sound is in professional sound recording gear.
Are you doing this to try to avoid Alternator/ground loop noise? If that's the case, run your TOS/Link near your head unit and go out to somewhere like Guitar Center and buy a mini-D/AC to go from TOS/Link to Analog. Keep in mind that you'll only be able to decode PCM optical-digital.