The only reason some of us may be saying that what you intend to do is "wrong" is that some of us may have tried what you are intending and learned that it doesn't work out so well.
And I'd expect all of us have traveled at one time or other to interesting places and learned what works well with film and what can get in the way.
I think you will find that splitting rolls of film will tend to get in the way, and result in your enjoying both your trip and the photography less. I base that on experience with splitting rolls, and experience with interesting travel.
I would buy a couple more rolls, and I would be prepared to waste a portion of them.
I hope that advice helps you enjoy the trip and the photography more.
And I'd expect all of us have traveled at one time or other to interesting places and learned what works well with film and what can get in the way.
I think you will find that splitting rolls of film will tend to get in the way, and result in your enjoying both your trip and the photography less. I base that on experience with splitting rolls, and experience with interesting travel.
I would buy a couple more rolls, and I would be prepared to waste a portion of them.
I hope that advice helps you enjoy the trip and the photography more.