Need help with lights

First, think about changing the wattage of the lamps. If the 12 recessed are on one circuit in need of a high wattage dimmer, even going from 75w down to 60w or 40w temporarily might make the space more use-able in the short-term.
Consider changing the wattage of the lamps permanently and forego the high wattage dimmer altogether. If you use something like the CREE LED A lamp replacement ( http://www.cree.com/lighting/products/indoor/lamps/60w-replacement-warm-white-type-a-led-bulb), moving to 9.5w each would allow you to use most standard dimmers. Or think about using CREE or Nora Ltg. LED recessed replacements as complete conversion.
Good luck!

Tim, you are giving very useful and succinct information

Lutron carries what you are looking for.