Yes. You'll have to use the "impulse" cheat code and enter the name of the function for the encounter. The function names for all enemies as of 0.8.065 can be found at
https://github.com/OXOIndustries/TiTS-Public/tree/master/includes; good luck finding the function names for anything implemented in the last 2.75 years, though, since the public GitHub is that much out of date. And don't forget to save first, in case Something Bad Happens.
Alternatively, the Treated salvagers from FIRST-14 can be force-encountered in the "test" cheat code's menu, and some enemies (mainly from KiroQuest) drop VR programs that allow you to replay their content through the Mindwash Visor without cheats.