Too little and too late for that to happen.
The GOP, Republicans, MAGA, etc did themselves in by becoming too far aligned and synonymous with people who sympathize or have literal ties with skinheads, racists, klansmen, fascists, etc to have any appeal to most Black and Latino/Hispanic people.
The reason they booed him was because they already knew what he was suggesting was a lost cause at this point...from here on out it's a whiteout (White people only) type of time for the Republican party.
As others pointed out, the GOP wants it to be one or the other, Black people and other ethnic minorities to vote for them (which is already a hard sell) or just not vote at all.