There are already a number of English-based conlangs, creoles, and pidgins that are effectively what you described.
https://en.wikipedia.org/wiki/Basic_English
https://en.wikipedia.org/wiki/English-based_creole_language
https://en.wikipedia.org/wiki/List_of_English-based_pidgins
This one especially: https://en.wikipedia.org/wiki/Tok_Pisin