OK, this may be somewhat cheeky but have you seen the Chronoswiss Lunar Complete Calendar (CH9323)? Whether in rose or yellw gold, it's stunning and bears more than a passing resemblance to the Breguet Classique series.
Would you remotely consider this as a replacement for a Breguet purchase? I am since it will allow me to test the Breguet look and my real need for a moonphase, acquiring a respectable timepiece valued at 6k usd without the need to sell my car to obtain a similar Breguet.