2 Soiree, 1 Drake & one more bathroom

We have 4 toilets in our house and we've been replacing awful 1st generation 1.6s with Totos. We've already installed two Soirees and they are great. One upstairs bath has a Drake. The Drake wasn't installed entirely properly and rocks a bit (yes, I'll get it fixed soon). My husband isn't as fond of the Drake and would prefer to put the Soiree in our Master bath. I had thought we might choose an eco-Drake for the Master. Is it possible to retrofit the regular Drake to be more water-wise? If so, I'd feel better about choosing the Soiree if we had at least one very low flow/dual flush model in the house. Is there another I should consider for this last bath?

You could convert the new Eco-Drakes to the G-max but you cannot change from the G-max to the Eco because the bowl will not flush the lower volume of water. You would need the Eco bowl as well.

Thanks for clarifying...I was afraid of that!
Wonder if there a eco version of the Soiree coming down the pike?