C-Class Broken Door Handle with Child Lock

I'd appreciate ANY help I can get on this. 

My rear passenger door handle (exterior) has broken. I think this may be in part due to my toddlers fascination with pulling it repeatedly back and forth while the vehicle is locked. Currently when you engage the handle it simply flaps back and forth doing nothing. Although it's pain, it's unfortunately not only issue I'm faced with because the child lock is engaged on that door so I can't open it from the inside either.

Thus far I have using the other passenger door located where the childlock switch is to see if it's possible to flick it off while the door is closed. Unfortunately I've not had any luck doing this - having spent a good hour or two fashioning various tools to attempt it. Any success stories on this with the C-Class? I'm not sure about removing the interior door panel - mainly due to the fact that there are around 8 clips that run across the diameter of the panel, some of which seem (from studying video/pictures) to be difficult to access when the door is shut. 

I'd appreciate any advice on the approach as ultimately I want to avoid going to a garage and paying several hundred pounds for a fix I could do myself. For example - given the exterior handle is broken - can I call a locksmith or use a hanger or something to open the car from the outside and then switch the child lock off?  

Thanks in advance.