So as mentioned after some testing I found my iPad Mini charger will charge my surface but the moment I turn it on I get the no charging but plugged in.
Also one solution for getting a second usb port is to use a USB powered USB hub and an external battery pack to power it, while this method is crude it should in theory work.
I don't think using an OTG will work, because as far as I know the micro USB port is just for charging and won't carry data, can anyone confirm this?
If you wish to use a wireless mouse simply purchase a bluetooth mouse instead and connect via bluetooth.