The Wallace Ornament (sic) is practically on top of the line. Could that warrant a funicular railway from a new station there to the foot of the ornament(sic).
Why did I not think of that? El Presidente Salmondo will s(h)urely award you with a medal.
(How about Causewayhead Station for Wallace Monument [also Stirling Uni])
Re Bannockburn you are right it is not that close for the Visitor Centre but Bannockburn itself is a sizeable community in its own right (would there be space for a P&R?) the station may indeed be viable without reference to any local attractions? Now any nearby sites would be icing on the cake and would attract additional off peak travel. I think the name itself would be enough to attract visitors to use the station - even more so if it was a) marketed correctly and b) suitable infrastructure was put in place to facilitate interchange.
You mentioned only 200 visitors a day to the battle-site but this equates to over 60'000 per annum and I would assume that most arrive by private car - now to effect a modal shift we have to put public transport infrastructure in place to try to entice people to leave the car at home. I'm sure that a station at Bannockburn would do this. 2x tph to/from Edinburgh & Glasgow & 4tph to/from Stirling would attract a lot of folk (trains to/from Stirling already carry significant numbers of passengers off peak for leisure/touristic purposes)
Please note once again the fact that a reopened Bannockburn station would not be solely for visitors to & from the battle-site but would also function as a commuter station for Edinburgh & Glasgow, a potential P&R for Stirling, and a station for local people who wish to travel outwith the area for short or indeed long distance leisure/business needs. The link with the visitor centre would be to generate
additional off peak leisure travel in the opposite direction from the main destinations of Edinburgh & Glasgow.
Now I was going to limit this to potential stations on existing passenger lines but if the Alloa - Dunfermline line ever gets re-opened how about a station at Culross for the NTS properties in the town?
(Or to cross the border re-open the line from Nuneaton to Bosworth Field to connect with the battlefield of 1485 and also the "Battlefield Line" heritage railway)