Hello, my name is Dimitar. I've been freelancing as a web developer since a teenager. Last year I've been mainly working with WordPress and I have huge experience extending the core or any installed extension.
If you would like I can take a look and give an exact estimate of the work here, but I expect around 5 hours of work to extend, test, and deliver the task.
I know I don't have any reputation here at the site because I haven't used my account here, but you would like to reach me I'll be glad to help you.
Regards,
Dimitar