I just don't get what the price of your amp has to do with it. It seems irrelevant whereas the price of the attenuator is not (too much for what you get in return).
As for the clean amp with pedals, I completely agree. Having owned a ridiculous amount of attenuators from cheap to uber expensive, I have always gone back to pedals through a clean amp for low volume playing at home. It makes no sense to have a bunch of money tied up in an attenuator that sounds, at best, equal to pedals through a clean amp.
At any rate, glad you found a solution to your needs.
TG