The most obvious would be to get Lang to fly the replica over the route again.
Failing that another race similar to the several 1934 1954 1969 etc ones. But with one difference NO GPS, map and compass only.
The idea of battery power is great but even with the new Tesla type batteries is probably not possible within the short time ie 3 years.
If you do go down the Air Race route you can count me in as a starter, having done this route twice.