You can only get a Validation if you are doing private ops, so unfortionatly that wont be an option for you.
Your best bet is to do the 14 exams, upgrade your license to a ATPL and do a skills test in the 737, as you have over 500 on type you will be exempt a TRTO.
Sorry i dont wish to sound all doom and gloom, but its the way it is. I just been through it all.
You should get a MCC with that time, i got one with 1100 on the King Air, you have to send a letter in from the CHief Pilot and all you log books too.