frejac wrote: none worked as good as the built-in.
You need to be a LOT more specific if you want informed advice. What does "[not] worked as good as the built-in" mean?
Are there functions missing? Then you supplement with Keymoves or additional functions in the upgrade.
Are the functions on buttons you don't like? Re-map them as you wish within the upgrade.
Do the actual IR signals emanating from the upgraded remote NOT working as effectively as the ones from the built-in setup code? Then your upgrade is not formatted correctly and may be using the wrong protocol.
Without a better description of your actual problem, it's next-to-impossible to provide you with an informed recommendation.
frejac wrote:Would it be possible to export the values from the remote, and get them into KM or IR so one can modify it?
There is no way to "extract" a built-in code from the remote's ROM, although many built-in codes have been replicated in upgrades. If you provide the setup code, one of the experts may be able to point you to a copy of its corresponding upgrade.
As for your OEM remote, your best bet is to try to get it working and learn the signals you want and decode them for inclusion in an upgrade.
I would say that what jeff suggests is as good an approach as any, but it presumes that you have the data for the entire built-in setup code, which may not be the case until you learn all of its buttons.