After having no success finding the magic Renault blank at any locksmith I tried, I stumbled upon a workable substitute.
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It's a commonly available key blank available at most locksmith shops and even better hardware stores in the U.S. The blank is an Ilco KK12-P for various Kia and Hyundai vehicles. (The black tape is for privacy online.)
Fits various 2017-2020 Hyundai and Kia models. We stock over 600 different car, automotive, vehicle and truck keys.
ekeyblanks.com
You will need to find a locksmith with a basic cutter as the programmable cutters can't seem to make heads or tails out of the Ineos fob. Different machines have returned varying chip/code numbers and still refuse to cut a blank. Additionally Ineos doesn't show up on the lists of known vehicles. Make certain whoever cuts the key is very meticulous.
When used in the driver's door lock the key will disable the alarm and unlock all five doors at once. When exiting the vehicle the key will lock all exterior doors. Inserted into the ignition it will turn the switch to the "on" position and all lights and pre-start functions will begin. Turned to the "start" position it has no effect until the fob (chip end) is placed adjacent to the key. The vehicle will then start normally and the fob can be placed elsewhere. Keeping the fob handy will allow for quick restarts if the vehicle is stalled, etc.
There is an unfortunate consideration with this blank. It is slightly too wide/tall. While the key length and thickness are correct, the width is approximately 0.015" too great. Five minutes of flat-filing solves the issue. Make a half dozen strokes on one side then switch to the other for a half dozen. Repeat until the desired width is reached. The new key should slide in smoothly. if it doesn't then the width may still be too great. Using a micrometer helps. You don't want to get the new key stuck in the lock or ignition. Good luck.