You could program it with a desk top computer. We can make a power cable for it. You will need a 12 V DC power supply - about 2 Amps and regulated voltage. The power cable would cost around $10, the power supply (Radio Shack) perhaps $30. Less than shipping after a couple of map changes. You can get a programming cable for a USB port or a 9 pin RS-232 port if you don't have USB.
I think the previous maps work with "M", the current one is just optimized for it. Try it and see.
You can send it back to us - we update them free, you pay shipping. Shipping is not cheap!