Firstly, I'd suggest that if you actually have a match pistol, it seems a bit strange to contemplate turning it into a wire stocked carbine. A match pistol does one thing very well. Everything about it is designed for 10 metre target shooting with one hand. Any customization ought to be in the realm of making the grip fit you properly so that the sights line up automatically with the target and your grip is secure over the duration of a match.
That said, I suppose you could do something like what I did with my Brocock Atomic pistol to add a wire stock. I tried to like it as a pistol but the stock grip was just awful for one-handed shooting, and I'm not a two-handed shooter. I have my Pardini K12 for matches and training, so the Atomic is more of a plinker. And as a carbine, either with a wire stock or with the Boyd's Blaster stock I fitted to it, it's a lot more fun to shoot than as a pistol. So it's been through a few iterations, and lately I've settled on the lightest version with a 3/8" aluminum wire stock.
The key to mounting the plain aluminum rod is a tube of steel which is almost a snug fit. I found a length of lamp rod and reamed it out until the aluminum rod could slide in with just a bit of wiggling. Then I found the location on the left side of the grip would would provide a good secure anchor point as well as placing the wire stock to the left of the scope, so as to place my cheekbone in the right relation to the scope eyepiece. Then I selected a small scrap of steel plate, 1/8" x 3/4" x 2", and brazed it to the tube at a right angle. I then drilled and countersunk two holes in the plate at strategic locations in the grip side. After drilling for screws into the grip through these holes I traced the outline of the steel plate then removed it, then carved out the wood until the steel could recess adequately into the grip. I then mixed some epoxy and set the steel into place and drove the screws in tightly.
It's not a pretty solution, but this isn't a pretty gun, it's a fun plinker. It's very light at about 3 pounds 12 ounces and shoots with admirable accuracy for only a 7.5" barrel. Of course for your particular pistol the dimensions and angles will be different, as well as your preferences for stock location, but the idea is simple enough. Oh, and to prevent rotation I just drilled a small hole through the front end of the steel tube and drove a finishing nail through that into the grip, then sawed and filed a matched groove into the front of the wire stock rod. The slot tapers in a V shape, such that it's a loose wiggle fit when it's beginning to nest, then snugs up to very secure when pressed home. Groove is about 3/16" deep. Takes a couple of seconds to mount or dismount the wire stock. Such a mount could stay in place on a match pistol grip at all times if you liked, so long as you embedded it sufficiently that the grip still fit into 'the box' with the 50mm depth meeting ISSF regulations, as found at all official matches. You could even do away with the plate, drilling and mounting a tube from the back of the grip then fixing it in place with a nail/pin which could double as a locking device for the tube into the grip (I'd recommend some epoxy around the tube as well) and a locator for the end of the stock rod.
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