Physical bodies are nothing more a projection in our consciousness like sound and light. Technically they have nothing to do with time travel, which in turn is not time travel as you have said but removing the barriers to other frequencies that represent time. I actually have no answer but more questions like, Is it available to readjust to another frequencies?, If yes what do we need to compromise in order to readjust to them?, Is it un-doable if we regret doing?
According to string theory, changing frequency would just change the body completely. As for time travel in general, there is no such thing as the past or the future. Now, according to the math, time can travel forward as well as back wards, but both the future and the past are destroyed due to wave function collapse. This is why all we have is now.
nicely summarized and stated from another simpler, clear perspective...
Thanks @rok-sivante.