Thank for all your answer.

My goal was to avoid putting to much money, that why I wanted to avoid facing and why the Velo orange is over my budget.

I heard some people fitting a 68mm deeper like you mention but I was wondering if you have thread left they will rust and after it would be a nightmare to take it out.

The space option provides by Barabaika is really good, if I make sure I have long thread enough like mention by Andrew. I will verify if it is symmetric, if yes I assume 1.5 on each side will be the best option.

Also, I never heard of threadless BB, I will look into that.