For the titles, there was some push, but nothing came of it really, to establish a formal American aristocracy, perhaps with the lesser titles of knights, esquires (sons of knights I believe, but don't quote me on that) baronets (hereditary knights basically), and barons (lowest of the peerages), so as to properly build up the British constitution (mixed regime of monarchy, aristocracy, and democracy via the King, Lords, and Commons) as the colonial systems (governor, council, and assembly) that aimed to emulate the British constitution failed to really develop the aristocracy in the provincial council. The council acted as the local House of Lords but was totally appointed and at the whim of the governor in many colonies, or appointed by the provincial assembly (representing the Commons) in some others. While councilors had the wealth to be the aristocracy and were, in fact, the local elites, they were appointed by the Crown/assembly with the advice of the governor but could be removed at any time, or had to get the good graces of the governor/assembly, while the Lords in Britain had independent wealth, title, and position from the Crown and Commons. Perhaps a fostering of lesser titles for the gentry and having these titled persons dominate provincial councils will help contribute to a stronger imperial system in America and keep them in the Empire longer, perhaps have some aristocrats in the UAC Senate to guide things and policy as the Lords/US Senate were rather powerful in the 19th century. However, there was some pushback from some colonial voices against a formalization of any aristocracy, but with barely avoiding a revolution or containing the violence as it broke out in this timeline, "co-opting" the colonial elites with some titles and addressing grievances with home rule (as you have already established) could help more with keeping America in the Empire longer.
Having the Five Civilized Tribes have some protection and autonomy would be in British imperial character, and the FCT were somewhat already accepted by the real-life US government until Jackson, and they could gain more autonomy if they fought for Britain in some war, perhaps best if the war was in the Americas. Or local circumstances changed so as to break down the drive to get the FCT out of Georgia in the first place.