Can I set up pass through in my HT2000 and let only my EdgeRouter handle ports for forwarding?
The HT2000w doesn't have the ability to be put into Bridge mode, or act as strictly a modem. On top of that, like Mark said, if you are a residential customer, you are behind a Double-NAT, port forwarding will serve absolutely no benefit.
The requirements to be able to do port forwarding on Hughesnet are as follows.
1: Have a Business Account
2: Request Static IP services during signup, if they are still available that is.
3: Recognize that the HT2000w is a combo unit without the option to bridge - you will be forwarding ports more than once, once at the HT2000w, and once again at your Edge Router. You have to be aware, the HT2000w has limited options for port forwarding.
You can read more here, but it is a guide for if you do meet all the criteria.