Download a Hex editor like HxD or Hex Edit.
Locate the right .dll/.exe to edit. (See lower down how to find those).
Backup the .dll/exe in case you want to revert / mess it up.
Open it in the editor and Search for Hex 4A0C823D, this is equivalent to the float value 0.0635f (which is the LensSeparation variable in the SDK in OVR_Stereo.cpp) - make sure the search dialog is set to "Hex-values" not Text-values.
Fortunately, this value is only used for LensSeparation in the current SDK version and often only appears once in games and demos. If you find a second, then that is a bit trickier because that value might be used elsewhere in the game/demo's logic. In that case trial and error or locating of other Oculus variable in the proximity can help.
Replace that value with the corresponding value (below) for your Lens Separation Attachments. Do not set it to your IPD, it must be in accordance to the new Lens Position.
(See this post if you want to know how/why this works:
https://developer.oculusvr.com/forums/viewtopic.php?f=34&t=11190&start=120#p171036)
69.5mm = 04568E3D
59.5mm = 46B6733D
Save and share your experience. I doubt there has been much focus on it by Oculus so it may well not work as intended and perhaps a slightly different value may work better for you.
Elite: ED\EDLaunch\Products\FORC-FDEV-D-1002\EliteDangerous.exe - There are two instances, the first one in block CE19CB-CE19CE is the one. Figured this out by trial and error, changing the other one crashes multiplayer