As annoying and effortless as it sounds, I'm pretty sure the honest answer is 'no'. Don't look at it as if I2s is some standardized format that is just being sent via one termination or another and that should be easily switchable, look at simply as a term; and one that in this case means different things from different companies. And Empirical Audio can do it because they're a manufacturer and they have the source signal from their custom made gear to work with, serious expertise, thousands of dollars, and their own company which specializes in digital audio. I'm not sure who you are, but I don't have those resources available for my DIY audio hobby.
I recently got the pin-out from the PWD Mkii HDMI-I2s from PS Audio because I was looking at making up my own LVDS->HDMI I2s cable to feed from an Audio-gd DI-V3 I2s output to my PWD Mkii HDMI-I2s input. I don't know much about the format, but as soon as I saw what was going on I gave up on the idea.
For me, it's back to trying to find a USB-> HDMI I2s convertor that doesn't cost more than my DAC... Damn pricey OR5... And although I know the OR6 is going to be in the same bracket, does anyone have any info on it yet? Now that Steve is moving away from the HiFace chipset I'm interested to hear some reviews. Especially since it'll be able to do Integer Mode now :-D That was one thing I really didn't like about it before, and also that USB->XXX convertors that could were said to approach the OR5 with Integer Mode enabled. Now with a levelled playing field the OR6 should be a show stopper?
I'm pretty much out of my depth here, but it seems like conversion of a SE I2S LVTTL format (M7) to a balanced LVDS format (PWD) would be more difficult than a balanced LVDS to a SE LVTTL formats. I'm still hopeful that my balanced PWT to SE M7 I2S conversion is achievable, based on DACLadder's efforts on his similar OR5 HDMI to M7 LVTTL per above.
The ironic thing it seems to me is that Kingwa was really touting his USB32 input signal port addition on the M7. And you guys here are really poo pooing it relative to the I2S connection on OR5. It's nothing if not audiophilic, eh?