If you're not going to let them bring TT bikes, don't have a TT.
Since when is a TT bike required for a TT? As andylancep said, it's not WorldTour so why waste the time, effort, fuel, money for an event they probably won't gain any useful info from anyway (windy and too short).
Since when is a TT bike required for a TT? As andylancep said, it's not WorldTour so why waste the time, effort, fuel, money for an event they probably won't gain any useful info from anyway (windy and too short).