Flashing the ecu to raise rpm, to do the timing adjustments and remove any restrictions is what he would do. To flash AFR he would need the bike on a dyno. If he can do it, you would not need the mechanical advancer. Then run your pc5 and auto tune for afr. I don’t have any competent dyno operators in my area. I’m running a auto tune on my street 12 and it has performed really good. Bike runs real good.
I appreciate your enthusiasm! As I'm sure others will tell you, especially Henry, tinkering with these old bikes now requires a lot of inventive thinking and generally scrappiness to achieve your goals!