There is some merit to this. But keep in mind though, some of these are heroes that were in the Founders time circa the 1770s-1790s.
The Republican Party wasn’t founded for another 60~ years give or take. Peter Salem died before anybody had any thought about a GOP.
What you’re saying is perfectly accurate. The point I’m trying to get across is that the nature of conservatism is to promote life, freedom, equality and justice which would make it appealing to all patriots. This transcends party label and even race; there were groups and individuals pursuing these ends long before the formation of the Republican Party.
All along, there have been people on both sides of the divide. Booker T. Washington believed that many involved in the civil rights struggle were taking the wrong approach. He despised the politically oriented Black preachers and strongly advocated training mechanics rather than ministers. DuBois, on the other hand, sought to provoke a massacre of Blacks which could then be used as a bludgeon against white society to promote the power and influence of his “talented tenth.”