need to tweak SSI using Apache

Hi

I have enabled SSI for a set of websites on my server.
All of them have include tag like
<!-- #include /includes/site1/generated_data/file4site1.html?param=value1 -->
<!-- #include /includes/site2/generated_data/file4site2.html?param=value2 -->
<!-- #include /includes/site3/generated_data/file4site3.html?param=value3 -->

This is working fine...
But i want to do a bit of tweaking...

I want that as soon as Apache finds this type of include tag (see a bit of difference in each include, tag corresponding to site) , it should actually convert this to something like this and then execute
<!-- #include /cgi/my-script.cgi?param1=value3 -->

Any way out...!!!!

Thanks in advance
Vikas Aggarwal