You could dig up clumps and give it to people or see if the local parks dept wants and or failing that, good old roundup.

Hope you find a home, i'd have it all off you if you live anywhere near Brighton.

If you live near Hull I'd take it off your hands too.
I have never known an epimedium run out of control. wish mine would .

Just dig out the parts you don't want and put them on Freecycle. I moved a chunk of one last year and it was fine.

The trick to getting it out is one small piece at a time, rather than trying to get a spade under a large chunk.