Hi,
I'm happy to help with this. I am a magento developer with over 8 years experience and I can help you with this task.
This task should take around 4 hours and I can start right away once I get access to the dev environment.
Just to be clear on the requirement do you need the text on the product page to change to in stock or out of stock based on the configurable / bundled product selected? If you could provide the URL I can have a look.
Thanks,
Ashala