Looks like a really sweet gadget, Doug. Thanks for the link. These are the people who make the "Bass Blockers" as I recall, right?
They seem to have several models, pre-wired for the existing steering-wheel remotes on popular cars. I didn't see Peugot mentioned, though.

Since it turns the button presses into learned-IR signals, it would need to place an IR transmitter shining towards the radio somewhere, but that's probably not a big deal.
Unfortunately, I couldn't see a price for that product on their page.
Tony FabrisEmpeg #144