Short answer is no. I'm not aware of any audio programs that can do anything about someone's accent other than voice substitution altogether. You can change tonal balance somewhat with equalization and spectral editing perhaps but I do not see anything actually changing the accent itself.
There is a tool by soundtoys called little alterboy which will pitch shift a voice, but that's really only good for making someone sound lightly more or less masculine/femine. what you're asking for is to outright change the voice to sound like someone else with a different accent. The way thats done today is to have someone with that accent record your audio - I've hired voiceover people from fiverr.com and had good results.
Adobe recently showed off some promising technology that made use of machine learning to feed in hours and hours of audio from a single actor, the machine would learn how they enunciate sounds and could convincingly synthesize them saying things they have never recorded.
Much how photoshop has made photographs hard to tell if they are real/fake, I'd expect this new technology to do the same for voice recordings. but I think we're probably a few years from the first commerical product and probably a decade or more before that's in everyday consumer products.