我会尝试的是：

What I would try is:

- 展开一个新的使用VS2012的DSL。

- unfold a new DSL with VS2012.

- 将Package.tt从这个新的DSL复制到你转换的项目。

- copy the Package.tt from this new DSL to your converted project.

（或将2 Package.tt差异化为了解有什么不同）

(or diff the 2 Package.tt to understand what is different)

问候