Styling Pro Sites vs. Hooking our own page to it

Adding more than four levels doesn’t look good in pricing tables of Pro Sites. We would like to be able to add more, as well as grouping them, so we could have some “higher use levels” in a separate section.

Another workaround for us would be to connect some other pricing tables template that comes with our theme.

So when a member clicks to sign up for a level in this custom pricing table, should be redirected to the registration page and Pro Site level is selected already.

Any feedback from associated developers, about hooks/filters that could help our devs to work on this, would be appreciated!