I bought an old (2002) Micra with one key last year.
For making a second key in the UK, they wanted 170GBP, which was a prohibitive price for me. It can be cheaper in Poland. Since the second key is worth having, I decided only to cut the blade in the second key, and from the first one I took out the immobilizer chip, I permanently attached it to the column cover near the ignition switch and the car could be fired with both keys.
I know that in this way I deprived the car of anti-theft protection, but I did it consciously. And the possible loss of one key in my possession would be tantamount to the decision to scrap the car.
And so, even for good money, I traded the car to the dealer when I bought a new one. And unfortunately they wanted two keys. And they got them