I'll help ya. The workingman has the piezo LeSon tweeter. I don't blame you for wanting to change it out. With the SWR workingham

cabs you need to make sure there is enough room to put a new tweeter in there, as the LeSon has a 2" cutout. Any other tweeter you pick is going to require a 3" cutout hole, with additional space needed for the bigger flange. THATS WHERE YOU CAN GET STOPPED with the SWR WM line.
You might consider the Eminence website and try the smallest supertweeter they carry, it might be smaller thann the typical Foster, Selenium type tweet.
Here's more pain in the ass, the SWR WM line has a small input panel on the back with a single resistor crossover. You have to make a bigger hole for a different panel usually if your going to upgrade the tweeter cuz you need a REAL cross-over now. As you can probably tell I've been down this road before. personally, I'd live with the stock tweet and enjoy the new driver. (Why an Omega? you can get alot of bang for your buck with the Delta Pro stamped frame line for way less $$ and less weight.)