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If it's pronounced Vallen-Teen like most Americans would say it, it's fine.
It'd have a pseud-y feel, imo, as the name of an American who talks like an American. I'd suspect it was a self-name.
But you need not mind that necessarily, esp since you say you are looking for a name with swag.
Valentin formally or on paper, Val to friends, seems like it would do the trick.
It's timed right. I bet nobody would think it seemed mundane or ugly.
Or even difficult. Valentin "Vallen-teen" is actually easier for me to say than Amelie.

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However, if someone is apparently an American and talks like one, and lives where fluent French speakers are infrequent and come from elsewhere - but introduces himself to other Americans as Valentin-pronounced-in-French (or attempting the French prn), and insists on that pronunciation ... I would feel like, 'Please just stop.' I might start just calling him Lestat instead. I can approximate French Amelie okay-enough, but Valentin would be next level, I'd need lessons.

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- mirfak