You don't need the "click insert b" if you use "custom plugin next" . This would add a plugin to insert b, then it would try to click insert b again. So after the first plugin to insert a, just use "custom next" for all the rest of the plug ins.
1. Custom PLugin Next. 2. Sonnox. 3. Cursor Right. 4. Transmod 5. Enter 6. Custom plugin Next 7. Slate 8. Cursor right 9. VBC. 10. Return.
Also, if trying to add sonnox, you can just type "sonnox", as pro tools will know which manufacturer that is from the first couple letters. So no need to type in the whole name most of the time.