Have a nice trip!
Mft will smudge fine details more often than anything with larger sensor.
Flash and tripod for what? BiF and wildlife?
Photography for what? Poster prints or post cards?
Personally, for me larger is no way better. But every time I need best quality guaranteed, it is DSLR with large or small lens on it and sometimes flash.
I would change my Canon 5DMII to RP. At some point
5DMKII is the largest camera body in my possession.