Power El wire from Mains
To change frequency you basically have to convert to DC and back to AC.

It would certainly be possible to build a circuit to do this at 110V but the cost of high voltage power electronics would almost certainly make it uneconomical given the low power requirements of EL wire. 

By far the easiest approach to powering EL wire off the mains will be to get an off the shelf EL inverter and an off the shelf DC power supply and wire them together.