Hi,
I think this should be fairly simple/painless for me to do for you. I write custom plugins all the time and please also check my feedback in here for reviews of my work. I speak fluent English and would love to help. If possible, I'd like to see the plugin before I start work - some are written terribly so if it is like that, I can let you know. However if it's ok, then I can start in and have the work done quite quickly for you.
Kind regards,
Chris