NOT KNOWN FACTS ABOUT SOUL COVENANT

In DS Remastered if i join a covenant and get to max rank ( let's say darkwraiths ) but then change to a special covenant through the bonfire do i stay at max rank Using the wraiths? Can also i still use items for example sunlight spear if I exploit the same strategy?Due to the electricity of VR you might confront Dying time and again, and enc