Hi PureWater;
There is a product called FixAll that you can use to make this work. What you will want to do is figure out exactly where you want the curtain mounts to be and then place some small bolts with washers behind the FixAll to hold the curtain rods. Once the FixAll has hardened you can sand, paint, and hang the curtains up.
I have made a drawing that will illustrate what Im talking about. You can also use some double backed tape to hold the bolts in place till the fixall hadens. you will want to do the fixall in stages. Dont try to put all the fixall in at one time. Do enough to secure the bolt (mix this thick like thin cookie dough), and let it harden well. Then do a second coat to fill the rest of the area removed. Leave it just a bit low. Mix the fixall so that it stays on the wall without sagging, but not too thick. Let this harden well and sand off any high places. Next do a skim coat to bring the surface level. Mix this like pancake batter. Maybe just a bit thicker so it doesnt run or sag. This layer shouldn't be any thicker than 1/8".
Paint to match and your done.
Oh yea almost forgot. The area you break out needs to go all the way to the steel and be at least 6" around. Wire brush the steel so the fixall gets a good bite on it .Otherwise you might just pull a hunk of fixall off when you hang the curtains.
You can get the fixall at any hardware store.
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The repair is really not all that hard. The hardest part would be mixing the fixall. After that it is only a matter of applying it to the wall with a putty knife.. An area big enough to do this with is easily knocked out with a small hammer. The plaster will break off easily with a couple whacks.
If you still feel that you can not do this you might want to ask around for a young man to do the job for you. If i were there I would charge you a whopping $20.00 to do it. If anything you can contact a local college. They always have students that could use some spare pocket money. Or maybe a good home cooked meal or two.
As for using an epoxy putty you would still need to get to enough of the steel to adhear it to. You can not just apply it to the existing plaster as it would just break off a bigger chunk of it.