Two MUI install pages, with different actions

I'm new to NSIS, and although I've read the docs, I'm stuck.
I need to have 2 install pages, with a custom dialog in between. When I hit the second install page, it repeats the same function calls as the first one - and I need it to do something different.

Is what I want to do possible, and if so, how can I achieve this?

Install pages execute all enabled sections. You can probably just make one (hidden) section disabled at the start, then at your custom page enable it and disable all other sections.