It sounds like your house light dimmers are a part of your theatrical dimming system, yes? I believe the ELC is a separate small console that would have to have its signal merged with your control console's. ELC does make a merger, but I'm not sure how well it behaves.
Another option that is inexpensive and easy to install is the Lightronics SR-516. It is a recently updated Pile-On type snapshot scene recorder. In essence, you install the base unit between your control console and your dimmers and it passively "listens" to the DMX signal and lets you record up to 16 "snapshots" of lighting looks. These scenes can be replayed later on without your console being turned on. The "pile-on" refers to the fact that the unit, if activated, will add its lighting look to the look being replayed by your normal console in a "highest value takes precedence" manner. The Central unit can also have two remote recall stations (located at convenient entrances to your space).
I'm not a sales rep, but have installed the units in my facility and saved me a bunch of money over mush more complex architectural control systems - like costing $1200 instead of thousands more.
If your current house lighting dimmers are not capable of receiving a DMX (or other control protocol) signal then your solutions are more complex.