I agree with this. I think Valentin is a fine French name.
An option which might not have been considered is looking for names which are used by French-born citizens which are not actually French. There might be some names there that fit despite that.
Another option is looking for the user-submitted French names. Some names are not in the database yet - just look at the France 2022 data; Nahël, Télio and Maëlo are not in the databse, yet there they are being used.
But this is of course an option to look into if the potential if mispronunciation bothers you.
If it does not, go with Valentin if you like it enough :)
Although I will suggest to go by your potential new name in online contexts first before adopting it in real-life social situations. I've seen many people do this so that they can get a feel for the new name, and easily replace it if it does not fit.
Good luck!
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