Yes, RTC-OnDemand can be used to connect with the Fixed-Route network to access the Las Vegas Strip.  Examples include:
Use RTC-OnDemand to access Route 122, then transfer to the Deuce on the Strip at South Strip Transit Terminal (SSTT)
Use RTC-OnDemand to access Route 103, then transfer to Routes 201, 202, or 203 at Tropicana, Flamingo, or Spring Mtn., respectively.
Use RTC-OnDemand to access Route 221, then transfer to Route 117 near South Point, then to the Deuce on the Strip at SSTT.