> language barriers due to the speaker accent (in my case) and the listener ability to understand English without subtitles.

It's usually easier for a non-native English speaker (at least below ILR[1] Level 3 or CEFR[2] Level B) to understand English spoken by another non-native, because the pace is slower, idioms and expressions are not used so regularly, etc. Your accent is much easier for non-natives than a strong Irish accent, for example. So I wouldn't worry about that too much.

[1] https://en.wikipedia.org/wiki/ILR_scale [2] https://en.wikipedia.org/wiki/Common_European_Framework_of_R...