It won't work because the IMEI is baked into the hardware. You're thinking about it in a simplistic way, and it doesn't work like that.
You're venturing into rather dubious territory discussing changing IMEI's, which is forbidden here (because it's illegal, even in the manner you're suggesting), I suggest you steer away from that, lest mods close your thread.
Your phone can be fixed (the IMEI/EFS can be re-written to the device), but it requires specialist hardware to do it, which you can either pay for & stumble around to try and learn how to use it without permanently borking your phone, or you can pay someone who already has the equipment & knows what they're doing 20 quid to do it in 10 minutes.
If it's important enough to cause you grief if it's lost, back it up. No excuses
Trolling for thanks is lame
Does Samsung's auto-brightness implementation crap drive you to self-harm ? A solution !
Most retarded thread on XDA in 2013