Change text in aepx file

Hello,

I need to produce about 100 videos from a single project changing some images and texts.

I found out that editing aepx files for the project I can change the images paths and do the renders with aerender.exe without needing to enter AE.

The problem are the texts, I found the text part in the aepx, even in Hex format, but when I try to swap one hex word with another, the change simply doesn't reflect in AE nor aerender. It just display the original text.

Is there a way to change the text content directly in the aepx to let me automate the 100 avi production without even entering After Effects?

Thank you very much,

Manuel.