Only way you can do it without a rom with 2.5, is to sideload Sense 2.5 into your rom. This can be done with the method
linked HERE.
Then I would say to use CHT 1.7.1, which you can find by following the Link in my Banner in my sig. below. The one that was attached in this thread, is an older version.
That is the only way I know you can achieve what you want with your current rom.