There is always a risk when bending, but the irons being investment cast has nothing to do with whether or not they can be bent. The material and how it was heat treated in the process of manufacturing does. While it is true that a material like 17-4 stainless steel might be harder to bend, it can still be bent in most cases. Most investment cast irons are either 17-4 or 431 stainless, both of which can be bent and if heat treated properly can be bent almost as easily as carbon steel. So the idea that just because an iron is investment cast it can not be bent is simply not accurate.
The information I was able to dig up indicates that they were made of 17-4 stainless. That may or may not be accurate, but probably likely. If so and if they were manufactured at a quality facility, I would say bending them 1 or 2 degrees should not be a problem. Only way to know for sure is to try. If no one in your area is willing to, you can send them to us, with the understanding there are no guarantees and they could break. We would know from the first club we tried if we could bend them and if we felt the material was not going to bend, we would not proceed.
Making them longer is an option, but I don’t like adjusting the length of a club to accommodate a lie angle. The length of a club should be the length that fits you and the lie should be adjusted to that length.
Britt Lindsey