Combining EE + CodeIgniter on existing website?

Hello,

It’s been a while since my recent post here, but I’ll be very happy, if I can get some help from you guys as well as to share an interesting scenario for other newcomers. 😊

We have a website running on a domain like this:

www.domain.tld www.domain.tld/section1 www.domain.tld/section2

Our goal is to rebuild certain sections on CodeIgniter, since we need flexibility, which is not available in EE (not because of its limitation, but because of the details we stress on in the new version). Simply said, we try to accomplish:

EE - www.domain.tld EE - www.domain.tld/section1 CI - www.domain.tld/section2

Is there any reasonable way to do this? I know it’s a matter of “hacking” EE core and / or heavily customizing, but any ideas are more than welcome.

Thanks!