first of all, you will need some kind of hack for that.
second of all, im pretty sure a injector/executor which is only able to execute SCRIPTS is not going to do the job for you.
what i mean by that is that you are most likely going to have to do this by memory. and you will either have to reverse engineer that by urself or pay someone a good amount of money since a spawning feature is not included in any hack thats currently beeing sold.