I am American, and I’m afraid to say that I do have trouble pronouncing [name_f]Ottoline[/name_f] quickly.
Enunciating Ts in the middle of words doesn’t come naturally to me. I also have a hint of a drawl in my accent that I suspect is very different from your ideal accent for this name. I wouldn’t say it’s too laborious for me to enunciate the t, but it definitely isn’t my first instinct or something that I do automatically. [name_f]Ottoline[/name_f] also isn’t my taste.
I prefer [name_f]Inez[/name_f]. I love the look and the sound of the name (with a preference for EE-nez or IN-nez rather than EYE-nez), and it feels more vibrant to me. [name_f]Inez[/name_f] [name_f]Mary[/name_f] is stunning! I also like [name_f]Inez[/name_f] [name_f]Leonora[/name_f].
I think either [name_f]Inez[/name_f] or [name_f]Ottoline[/name_f] could go well with [name_u]Tristan[/name_u].