Now I don't know how the Deland-Daytona area is developing because I'm not down there much, but by looking at Google Earth, I see there's a huge plot of land north of US-92 (which is probably swamp) that would be a perfect spot to build a FEC-CSX connector. I agree, Palatka does have a nice museum, but Jacksonville actually has a lot more history and the old Union Terminal would be much more suitable for operations than today's little station.
A line cutting through from DeLand over to Daytona would be sublime in my book. It would certainly be a more appealing option than the Thruway connecting service currently offered from DeLand Station (which is actually nothing more than a taxi-cab).
That area of Volusia County south of State Road 40 and north of US-92 is largely undeveloped cyprus and scrub pine forests. A possible route would involve using the existing four-mile spur branching off the CSX A-line near the current Amtrak station (f.k.a. DeLand Junction), or building a new branch within a few miles north before hitting Deleon Springs. This track would continue northeast along the north side of US-92 to Daytona. Punching through to the FEC main by continuing east across I-95 could be cost-prohibitive and unpopular, so the line could instead turn north once reaching the interstate. A station could potentially be located near I-95 and US-92 (International Speedway Blvd), along Daytona's western edge.
From there, the track would follow north alongside the interstate up until the junction of I-95 and US-1. At this point, where the FEC main line crosses from the opposite side of the interstate, the tracks could merge and the connection between CSX and FEC would be complete.
Of course, if the day ever comes where Amtrak runs trains along the entire FEC main, it may be deemed of importance that any potential Daytona Station be located along that line. If that is seen as a real possibility, an alternate route for the CSX connector could turn off the A-line somewhere between Deleon Springs and Barberville and follow an eastern route along the north side of Highway 40. Using this route, there may be potential in making a stop for Ormond Beach either near the junction of 40 and I-95 (where the line would again turn north towards following I-95), or northwest of town at the junction with the FEC main line(allowing stops for both main line trains and those on the CSX connector).
And for the record, other Florida communities that are home to railroad museums or prominent rail exhibits include Parrish, Winter Garden, Ft. Myers, Green Cove Springs, Lake Wales, Dundee, Live Oak, and Zephyrhills. None of these has had passenger train service in decades.