You can't skip the regionals because you have a type rating. You can skip the regionals if you have thousands of hours of turbine PIC time. Now, if you got the cash, it might be a nice thing to do, in fact, you might be able to combine your ATP ride with the type ride, saving money. There are probably lots of applications you fill out in the future that ask you what kind of type ratings you have, but I'd only suggest this if you have the money laying around and are not struggling.