Corkscrew & Pingu, then BP to Mushroom and down the powerline is a good way to get to Forever After. You can ride down BP from the Severed entrance to get to Forever After, but, in my opinion, that section is more difficult than anything on Forever After. The fastest way to get to FA is up the climbing route, then BP & Mushroom, and down the powerline.
Getting to Asian Adonis is super easy now with the new "Dickie" line that goes around the rock roll at the entrance to Severed. It shows as a black on Trailforks, but its really a blue. C-Buster to AA is pretty straightforward. The easiest exit is to take Adonis Buster back to Lower C-Buster, and then Rapid Transit to Slippery Salamander, on which you can go in either direction to get back on Bridle.
A good progression to Seymour blacks would be John Deer --> Asian Adonis --> Forever After --> Pingu --> Severed --> Pangor --> Dales.