I remember doing French at school and the teachers asked us to say the French words in a French accent, it sounded ridiculous. Also it's so unnecessary.
French footballers come to England and speak English in a French accent as far as I can tell. Quedrue for example never tried to do a boro accent when he was speaking in English did he?
Cantona didn't do his when ze seagulls follow the trawler speech in a thick Liam Gallagher accent did he?
In my opinion people should stay in their lane and do other languages in their own accents.