Since Renault started giving out some Europe maps for free (and those not fitting on the standard non-Europe TomTom SD card), a couple of people have stepped up the work to try and clone & resize these cards. SpeakEV User Sandy posted this tedious but awesome procedure to get it done. It’s unverified, but it seems we’re getting there. See the 7th post in this thread.
Edit: I created a more detailed step by step instruction here. All credits to Sandy though!