Aloha and welcome,
I haven't seen it done on a 25 but any boat
with a pushpit (stern pulpit) can have the stern seats added. Go down and look at the 25 to see if there is enough space to still steer the boat and handle lines plus two stern seats to see if it is possible. Depending on how big your girls are you might consider the weight distribution too. If there is an outboard
on the stern and then the added weight of 2 100 pounders it may make the stern of a 25 squat while they are seated there.
I like your attitude about trying to make a boat desirable for the kids
to keep their interest.