whether over the Trumpists would support such a candidate - they already got quite hysterical over other candidates speaking foreign languages
English plays a different role in the US than in the UK - a common language* is traditionally one of the (very) few things holding a large, very varied country together, weakening it is like pulling half the screws out of a table, it'll still stand for a while but it'll be wobbly...
Trump appealed to people who want a country rather than a glorified facebook page... the winning policies aren't hard but the party establishment (in both parties) is determined to not let a candidate through who wants
- improve infrastructure
- support manufacturing
- get control of the borders
- get control of the corrupt medical insurance criminal racket (and the pharmaceutical criminal racket)
- return education to being about learning things rather than social experiments
- repurpose the military to be about domestic defence rather than insane middle eastern facultative wars... (like Iraq and if Biden has anything to say about it... Iran).
Trump touched on some of those which is why the establishment hated him (he was crap about carrying them out but he did a few things, although hampered by his blindspot regarding Ivanka and her horrible mole husband).
*a great achievement in the US is the creation of a really neutral national standard (General American English) that anyone regardless of region or race or social class can use (often alongside more regional versions) AFAIK all varieties in the UK are heavily marked for place or class and code-switching between varieties doesn't seem to be a thing