I think you'd have to be prepared for a lot of mispronunciation. You'd get uh-lass-tree-OH-na a lot, and gwin-EER-uh.
Also with
Alastriona when pronounced correctly it would get shortened to Treena straight away so you'd need to be ok with that.
They're both nice, just not easy.
https://nanowrimo.org/participants/christine-seaforth-finch
http://christineseaforthfinch.blogspot.com/