If the supported tools exist, I doubt they would be publicly accessible. Console modding was a rule violation when Volition had a hand on this site.
Keep in mind, the primary tools available (for SR3, 4, GOOH, etc) were developed by ex-Volition staff on their spare time, with a focus on the .vpp_pc files. As such, vpp_xbox2 files didn't really have a point of focus from them.
In the case of the first two titles, the lack of a port for SR1 on PC and the undignified state of SR2's PC port were incentives to craft compatible tools to access their Xbox files. Console tools for SRTT, however, wouldn't nearly be as viable. Doesn't mean the answer isn't out there, but I doubt much thought has gone to the idea of converting the Xbox files.