How to tell ffdcaenc to deal with DTS-ES 6.1?

[Perenista]

I have picked a DVD of my own in PAL, so I changed to NTSC using MKVToolnix.

But the 3 audio tracks need to be "converted", too.

This is what MEDIAINFO says about all 3:

https://pastebin.com/up74KrDN

1st one is DD 5.1 EX, 2nd DTS-ES 6.1, and the 3rd DD 2.0

What I did so far:

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eac3to track1.ac3 track1_ntsc.ac3 -slowdown
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eac3to track2.dts track2_slow.wav -slowdown
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eac3to track3.ac3 track3_ntsc.ac3 -slowdown
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Tracks 1 and 3 are in sync with the new MKV, which is now NTSC.

But track #2, which is the DTS-ES 6.1, needs an additional step to be done with a program called "ffdcaenc"

The goal here is to not "reencode" or (since a "fps" change is needed) do this in the best quality possible. What is not acceptable is to generate a 4 GB filesize from a track that is 1 GB. So no "FLAC".

I asked AI what to do, and was told for the DTS-ES 6.1 one, to do that WAV step, then a final with "ffdcaenc". But the AI is also telling me "ffdcaenc" does not support a DTS-ES 6.1 track. So it offers me multiple choices to convert this, but they are not exactly DTS-ES 6.1.

Any ideas?

P.S. Original MKV (PAL):

https://pastebin.com/PQ3pQvpD

New MKV:

https://pastebin.com/S37N2atJ

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UPDATE:

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I looked into this more carefully and discovered that WAV command is actually creating an imcomplete file. Instead of 3h, we have less than 1. Probably because the end result is bigger than 4 GB.
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So I decided to put it in DD Plus 5.1 anyway

This is what I did:

1st, convert the "fps" from 25 (PAL) to NTSC:

eac3to track2.dts track2_23976.flac -slowdown

track2.dts = the DTS-ES 6.1 one, from the DVD

2nd step:

ffmpeg -i track2_23976.flac -c:a eac3 -b:a 768k -ac 6 track2_ntsc.eac3

As you can see, converting to FLAC 1st does not create an incomplete file. It still has over 3h.

The resulting file has a similar size of 1 GB.

It's not DTS-ES 6.1 anymore, but I don't think there's a way to change the "fps" and also keep being DTS-ES 6.1. Not that I know.