Lucas!!!!!!!!!!
You can do that without increasing frequency since you already have 5 frequency and only two TRXs. The only problem that you gonna have is MAIO allocation with only 5 frequencies and using 1/1 you can have only one TRX hopping per sector(3 sector site) excluding BCCH. I would advice you to increase your hopping frequencies you will need about 10 frequencies for max 2 TRX/cell hopping.
I hope this answers your question