Can I Combine Two Three-Way Switches and Add Outlet?
You will not be able to combine those to 3-way switches with the switch you have shown. You'll need a double 3-way combination switch, which is two 3-way switches combined. It looks very similar to the one you have shown but with two extra screws.

With the wires shown in your picture, adding the outlet won't work. You've either got load wires or hot wires or a combination of both connecting to the common terminal of the 3-way switches and I don't see a neutral in there. You might be able to fish a hot, neutral and ground to that location for the outlet. Hope this helps.