This ASIO Bridge seems wonderful! that's exactly what is missing to JRiver. I think that the JRiver team should try to contact the developer. He seems to be an expert in writing audio drivers. He's french, if any help is required to contact him I can help.
I'm not quite as impressed.
You can't evaluate it to see if it works for you without getting nag screens over and over.
There are a number of small usability issues, e.g. the default volume after installation is 99 for one direction instead of 100, which adds yet another place that might break bit perfect playback.
Worse, for example tho DSD to foo_dsd_asio via the ASIO bridge and then on via DoP to my hardware does work, the ASIO bridge thinks that the DSD sample rate is 44.1k: every time you transition from DSD to 44.1k or visa versa it doesn't change the sample rate and so your sound is garbled. Clicking twice on the Direct/Passthru button fixes it but there's no way I'm doing that every time my playlist goes from DSD to 44.1, etc.
Another example: Even tho I never mess with ASIO buffer sizes with any of the handful of devices I have (except when I first install them), the ASIO bridge doesn't work for one sample rate or another without me changing my other driver's ASIO buffer sizes: if I fix it for 44.1 then 192 might fail etc. Some of my ASIO drivers don't even allow me to change their buffer sizes and hence the ASIO bridge doesn't work with them reliably at all...
I'm sure that these can be fixed, but I'm not waiting for it.