Yes, it's extremely possible. You can "Spump" it. You mod the striker and valve to disable the blowback. Then you just attach a pump kit. However, it will come out only about $10-$15 cheaper. If you want a KP, just get the KP straight from azodin as it's a much cleaner job unless you are reeeeeally good at making spyder pumps.
Wouldn't you have problems with just 'attaching a pump kit' as there really isn't anything the pump kit can grab onto short of modding the body/bolt? Or am I missing something?