There are some "dual audio" LE builds in circulation on the internet. Not available from these forums, and not endorsed as a great idea (as the code is hacked up) but might suit your purposes. Google has details.
Posts by chewitt
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WebHome < U-Boot < DENX <= anything capable of using Android and LE will be using u-boot.
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Let the hangover wear off, then go read post #8 again

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OSX drivers would be worthless on Linux. Job security would be terrible because everyone expects drivers for free (even the manufacturers)
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milhouse images don't contain the Slice overlays or drivers for the DAC/LED's. Unless you're self-building images you'll need to wait for alpha releases to start up.
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Moonlight is in our add-on repo. No steam stuff.
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Your add-on allows the TV and BT headphones dual audio, correct?
Incorrect. It auto-switches to BT when a speaker (or headphones) are connected and switches back to normal audio when disconnected.
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Windows allows you to force resolutions regardless of what the TV advertises. Linux does not. We don't intentionally support running on old laptops so you are probably better off using Kodi on Windows.
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Post a Kodi debug log.
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You need to share "dmesg" within a few minutes of boot. The log you posted has rotated and contains nothing useful.
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Python things need to be baked into the OS image, it's not possible to install them.
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Nothing leaps out to me as being wrong but I'm no Samba genius. If you use smbclient from the console, what error message is returned?
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He already tried "FR" which is a valid regdom. It appears to be something else .. but debugging wireless connectivity issues requires rather specialist knowledge of radio properties and without some nice error messages to Google progress will be non-existent.
MikeKL sprunge.us is offline (and may not return) so can you repost the files to ix.io or pastebin.com?
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Hmm.. looking in sources it appears to have been added a while back and I'd not noticed. I must work on my omnipresence

So if that's the location. I'd guess there is some issue with the changes you're trying to make. Alsa config is a bit of a dark art and few people understand it so advice is often not forthcoming.
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AFAIK LibreElec supports dual audio output (analog + hdmi) out of the box.
Not with alsa reconfiguration, and in Harry Potter terminology this is a 'dark art' that few people understand.
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Like finance investments "past performance is not a guarantee of future performance" and with GPU drivers we are ultimately dumb consumers of what the vendors publish. I'm far from being an expert on the history of things, but VDPAU is dead and newer AMD drivers use VAAPI (as does Intel) which is still evolving. It's worth Googling the driver mailing lists and vendor bug trackers for issue reports and responses, because ultimately that's where things need to be reported and resolved.
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Have you enabled BT under 'services' in the LE settings add-on? It is not on by default.
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MT7610U has a Linux driver that "works" but makes crappy Realtek drivers look like polished perfection. It does not follow basic kernel standards for important things like wireless regulatory domain and is not of sufficient quality to consider adding into LE. The related but older MT7601U was ground-up rewritten and has had in-kernel support for about 18-months, but there are no signs of it being extended to the the newer mediatek chips. As is usual for far-east wireless chip vendors, they appear to have no interest in Linux.