Install deadbolt in metal steel door and door jamb
Since you already have the holes drilled, it seems you will need to make this work somehow. The latches that are supplied in many new lock sets typically have a few face plate options for the strike bolts. Since these types of doors are made to accept dead bolts at the place they are assembled, you will have to use the option that has no face plate for the edge of the door. It is typically a thickened ring that fills the rest of the 1" bore in the edge and held in place by a snug fit and the connection with the deadbolt cylinder. 

You may need to ream the 1' bore a little more to get the bolt in all the way, If that is not practical, you may be able to reduce the outside diameter of the added ring on the bolt. 

With the 2 1/8" bore, it will not handle the compression of the screws that hold the cylinder in place and will always come loose if the bore is not reinforced with properly sized wood blocks that will keep the thickness intact while the screw hold the cylinder in place. Metal will work too if you can get it the right size.

About adding a strike to the door jamb. It can be done, but to make it look nice and not hacked up it will require a lot of time and tedious cutting and gluing in inserts to receive the screws to hold the strike in place, all for the effort to make a "pretty" hole. I would in all seriousness, simply drill a 1" hole in the jamb and be done with it. It will be plenty strong. The metal strikes that come with latch sets are to strengthen the wood jambs to make them more secure. The meal jambs already are.