My suggestion would be to continue with 'advanced' training and when you can, fit in a hire and fly the following day or week, that little bit of currency should be enough to keep the owner happier?
If you can choose a good instructor that will give you plenty of freedom with the 'normal' flying tasks, with the usual pointers here or there it shouldn't feel to much different from a command flight and you have the added bonus of learning whatever new skill it is you're focusing on at that stage.
10hrs really isn't a lot, 10hrs a month still isn't a lot and it's surprising how quickly you lose some of the skill set, especially if you are removed from the avation environment as well.