Final glide, total energy compensated vario and driving an analog vario - you got a cool project there
Please remember to document it all and write a nice presentation
I guess a lot of people could be interested in "upgrading" old instruments to better performance.
Last week I tried a Duo Discus with a LX9000. It was really nice to see which part of the circle I was gaining and loosing.
I'm not sure it's worth to recalculation the load factor and change in polar based on a G sensor. It's a rather short time that you pull the high G ... exept for the wind launch of corse.
Good luck getting the two devices to talk to each other.