While I don't belong to the same group, I've been working remotely for a bit over 2 decades now (not continuously at first, but yes for the last 15 years) so on weekdays I do end up speaking more in English than in Spanish (my native language) with other people, and I definitely have the same issues you mention with number-words.
I'm not sure if it's related but a similar thing happens with spelling. I guess because there's some ordinal relation to the letters in a word? But I feel whenever I need to spell my name in English it takes me about the same mental effort as giving my phone number, and I'm otherwise rather fluent in that language.
I'm not sure if it's related but a similar thing happens with spelling. I guess because there's some ordinal relation to the letters in a word? But I feel whenever I need to spell my name in English it takes me about the same mental effort as giving my phone number, and I'm otherwise rather fluent in that language.