Concrete centralized setup without access to the server

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Hello everyone,

I want to setup a centralized concrete core. My setup looks like this:

- site_1/index.php
- site_2/index.php
- concrete_core/

Domain_1.com redirects with mod_rewrite to the map site_1.
Domain_2.com redirects with mod_rewrite to the map site_2.

The index of site_1 and site_2 both include the concrete core-code.

But I ran into a few problems. And I can't figure out a way to solve them without having access to the apache or php installation (php.ini and such).

Is there any chance I could setup a centralized concrete5 core without having to access the apache or php installation on a windows or linux machine? If yes, could someone explain to me how?

Thanks a lot.