Decent ideas. I tend to err more on the BRT side knowing money is finite, and good will for transit in Cincinnati is even more so. BRT is a great starting point with pretty low investment costs, then lines could be upgraded to light rail if the BRT is run well enough to improve the regions view of transit.
The Cincinnati to Oxford line will happen, no doubt. Oxfords Amtrak station (on the Cincinnati to Chicago line) should be opening in 2026 or there abouts, and the return to daily service will be a huge boon to ridership. Especially as the relatively wealthy Miami student base wants to come into the city for more entertainment options. This will eventually warrant more than daily service, but I doubt management will ever be taken over by a regional rail authority.