Add three grand, plus the cost of your blank, to the gun price. Still a good value? As the the trigger guard needing to be shorter look at the holes in it. Can rework the guard or will a new one need to be made? The lower tang might need to be bent upwards or if short enough you might be able to only need a slight alteration. Your stock maker will know based on what your final stock dimension are going to be. A good restock will cast about three grand, some will do it for two plus, but the wait for a top stock maker might be a year or two. One fellow I knew stopped taking jobs because he was over two years behind already. Allowed him to pick and choose both jobs and people he work with. I suspect he did squeeze on a few jobs for regulars even with a long waiting list.
If you were just going to make it longer you could think about a butt splice stock job. If in doubt do a search on this site but to be short you cut the stock off just behind the checkering, add a spline to reinforce the glue joint and epoxy a rear blank onto the grip portion of the old stock. Saves all the in-letting and gives you a very large rear stock to make fit as you want.
There was an aftermarket POW add-on that could be used to give a straight grip gun a POW grip. Looked like hell but did the job. But other than a wood extension or one of those hideous two inch thick red rubber recoil pads a short stock is a pain.
