2.1 disability...

" What do you have for speakers and subwoofer?"

Great question. If your subwoofer has high-level inputs in addition to your LFE connection, you may be able to come off stereo pre-outs instead. Resetting audio out option from 5.1 to stereo would de-activate the LFE out. You would need to find a method for de-activating the high-level inputs when running in 5.1, of you preferred the LFE in that mode.

Manual for the Pioneer DV48AV shows that if Audio Output mode is set to Stereo, then Center and Subwoofer outputs are disabled, and the 5.1 channel front Left and Right jacks act as a second pair of stereo outputs.

If these specs hold true for the DV47Ai, and if the Reimer Sub has high-level inputs, then there's a possible direct solution.

Connect all of your speakers, including front stereo speakers, to your 5.1 group of audio outs, with Subwoofer into LFE connection.

Then, connect your extra pair of Stereo Outs directly to the subwoofer high-level inputs.

Then with Audio Output mode set to "5.1", extra stereo out (and thus high-level sub feed) is disabled, and LFE feeds the sub.
When Audio Output mode is set to "stereo", LFE and center channel are disabled, with 5.1's L/R feeds driving the front speakers, and extra stereo outs driving the sub.

Of course, when your new Oppo arrives, all of the subwoofer options so well covered by Mceljo and more will be available.

BTW, your speaker selection looks fascinating!

Larry,
We're all very glad that it worked out for you!

With such a great ($13K+?) speaker system, I've gotta ask -have you considered setting up a dedicated stereo pre/amp pathway in the future? With 95 dB efficiency, bet they would also sing with tubes.

As to your qn: "The 93 only has the 5.1 outs so that would not work in this configuration that you have figured out, right?"

I believe that the 93 and the 95 provide a "stereo" mode where you can set front speakers to "small" (thus activating crossover for sub) and set subwoofer to "on", as pointed out by Mceljo above. This eliminates the need for the extra stereo out jacks to run your sub in stereo mode.

That being said, the 95 seems to be a huge improvement over the 93 for audio. Massively better power supply, superior DACs, dedicated, discreet pathway for stereo, and many other bonuses.
I think you should consider using the dedicated analog stereo out pathway provided by the 95. Modwright also is now modding the 95, and claims that the result is equivalent to its well-reviewed Sony 5400 tube mods. I hope to hear the modded 95 next weekend at THE audio show in Newport Beach. If I learn anything new, I'll try to post back here.

BTW, your Audio Refinement Pre2DSP is a true sleeper value, yes? Wasn't that designed by YBA?
Are you also using the matching 5-channel amp?

Thanks for the kind invite to hear your incredible system. If I ever have a chance to get back east, that would be a real treat. How would you describe your Tetons? And what's the back-story on Reimer's, anyway? Are they becoming collector's items now?