I think your taste is really lovely, very soft but still distinctive. With a three-syllable surname, I’d definitely stick to something short and neat with [name_f]Nicole[/name_f], like you said.
From your list, my favourites are [name_f]Ines[/name_f] [name_f]Nicole[/name_f], [name_f]Frida[/name_f] [name_f]Nicole[/name_f], and [name_f]Nicole[/name_f] [name_f]Belen[/name_f]. They all flow really naturally and don’t feel too long or fussy. [name_f]Ines[/name_f] [name_f]Nicole[/name_f] feels elegant and slightly romantic, [name_f]Frida[/name_f] [name_f]Nicole[/name_f] feels artsy and confident, and [name_f]Nicole[/name_f] [name_f]Belen[/name_f] feels warm and very pretty.
I also really like [name_f]Nicole[/name_f] [name_f]Luz[/name_f], [name_f]Alba[/name_f] [name_f]Nicole[/name_f], [name_f]Clara[/name_f] [name_f]Nicole[/name_f], and [name_f]Nicole[/name_f] [name_f]Alma[/name_f] for you. They have that Romance/Hispanic feel without being hard to say in [name_f]English[/name_f].
My personal top choice would probably be [name_f]Ines[/name_f] [name_f]Nicole[/name_f]. It feels grown-up, feminine, and memorable, but still simple.