Replacing window in masonry

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Existing window is framed in 2x4 wall with 1x6 'framing' and 2x2 trim on the outside. I want to replace it with a picture Vinyl but since the sill (stone) is higher than the frame I'm thinking I may have to leave the 1x6's in place and order a window 1/2" less than the width and height then cut off the flange. Question is, how do I securely attach it to the building or is there another approach?
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The right approach is to have a mason come in and remove some stone, install the window per installation instructions (visit Pella's site for example) and then replace the stone by the mason.
Anything else is a waste of money.

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