Gary,
If it is still important for you to start in a bunker you can create (like I did) a simple mission and select any airfield that has these then it's possible to place your Su-25T inside them. I did this to practice the whole start up, rearm, taxi, take off, wander around a bit and land thingy. Very basic but was useful to me.
Runway numbers haven't been around for a while. You can get the numbers from info on the map by clicking on the airfield.
As an aside I would be interested to know if your kneeboard works properly with the Su-25T? Mine is stuck on the first page.