This is how I would do it
Replace your existing switches with the two way momentary rockers that I linked to
The light output is increased to full (or any desired brightness) when the switch is momentarily pushed up,and reduced to 0 on the down position
You will need to add these hard wire dimmers (available in various amp ratings)
Digital Dimmer (10 Ampere) - PN 7503 - Blue Sea Systems
And wire it all up (or have an electriction do the work)
Note: they are not simple inline dimmers,you will need to reroute and add at least one or more wires to the switches
It will depend if you have reasonable access to the wiring
The result will look perfect
Size the dimmer modules amp rating 30% higher than your load draw if using halogen lamps to compensate for their higher inrush current
Note also that these types of dimmers will not work on led lamp replacements