Widen Existing Door Jambs?

Hi,

We have recently had some rooms of our 1940's brick home relined with direct stuck plasterboard. The existing timber door jambs were the same width of the walls so each side of the jamb was flush with the walls. The doors of the rooms sat flush with the inside of the rooms. Now with the plasterboard lining the jambs are atleast 10mm (thickness of the plasterboard) too narrow.

I have a couple of solutions suggested to me, however not too sure what way to go, the solutions so far are as follow:

1. Fix necessary width strips of timber to the jambs and match the stain of existing jambs - This solutions would be quick and easy, however, the door would sit at least 10mm in from the walls and if I were to move the door to be flush with the inside of the room then the screws for the hinges will most likely screw between the exsiting jamb and the strip...would that be a problem ie strength?

2. Remove the door stops, cut the jamb and remove a section of the jamb where the door stops were, so basically cut 50 mm width of the jamb, replace it with a 60 mm width and then cover the join with the door stop - I like this solution, however I have no problem cutting the long face of the jamb with a circular saw, but no idea how I'll cut into the corners of the jambs?

Hope that all makes sense, and hoping someone can help!

Cheers


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