I'm not sure it's going to take much effort for most Republicans to seperate themselves.     The assumption that Republicans are all for one and one for all is clearly not the case.     I don't think the country has any trouble seperating the Presidential candidate from the state politicians.   

If some candidates are tied to Trump, great, it mean we remove an obsticle to BOTH parties for those who would like good working relationships to make smart national policy.     And if a R -candidate sounds more like Joe Biden  but still supports Trump as his party's candidate, he/she  may do fine.