Hi,
I work with Concrete5 on a daily basis for clients such as AXA and LV, and I know my way around creating packages and blocks, as well as modifying everything else.
I have been working with Concrete5 for a year, let me know which version your site is in.
I can work 8 hours a week maximum currently at the bid price per hour.
I am a registered limited company, so can do the work outside of freelancer if you want to avoid fees, message me if you'd like to take that route.
Thanks,
Richard