I would be hesitant to trust anyone's workmanship who says they can just slip the pattada blade into a laguiole handle. I'd be willing to bet that you'd either have to have a new blade, spring or both made for the knife to work properly. My suggestion would be to just have the knife custom made. It would probably cost a little more than a modifcation but at least all parts would be made to fit together correctly and you would have a lot more control over the finished product.
Something like that should be made by a true artisan. Recently I received 3 knives and waiting on a 4th from a French maker named Renaud Aubry. On his website, there is a configurater module that allows you to choose handle material, different file patterns, even different bees, amongst other things. While most of his knives are semi custom, he does do full custom work. I am planning to do a full review of his work once my 4th knife arrives. In short, his work is excellent and his prices are extremely reasonable. In fact, all of the knives I've bought from him fall in line with most standard GEC prices, even with shipping. It wouldn't hurt to send him an email asking if he would be willing to do it and what it might cost, although the final cost would be dependent upon all the other parts of the knife and how fancy you want it.
I'll leave his website address on your visitor messages page. Good luck!
so I hope you find someone who's willing to make your wish come true 
