Point 1: In "Bloodlines" La Forge makes modifications to the Enterprise-D's transporter to enable subspace beaming. However in Star Trek 2009 I only recall an equation being entered into the computers to enable transwarp beaming.
Point 2: if I recall correctly from MU: Rise Like Lions, Memory Omega uses subspace beaming to bring Jean-Luc Picard and Deanna Troi to Memory Omega's secret shipyards in the intergalactic void.
Point 3: the 29th century Temporal Integrity Commission must have the transwarp beaming equation as a component or predecessor of temporal transporters because the Relativity was never shown using warp, slipstream, coaxial warp, etc yet it transported Seven and Janeway to Kazon space to Mars, etc. And the only risk is "temporal" psychosis, not "quantum" psychosis.
Point 4: in DTI: Forgotten History, the Vedala transport T'Nuri, Mejian Grey, and Antonio Delgado from Earth to some uninhabited system outside the Federation. Is that transwarp beaming? Plus, in TAS: "The Jihad", the Vedala pull some kind of time trick on Kirk and Spock. Given the Vedala's age, I assume that they pulled a temporal transport on Kirk and Spock.
Point 5: if the epilogue of Engines of Destiny is to be believed, then Scotty has to be alive if he's around to dedicate his own Starfleet Academy building in 2422. And in good enough health too.