I propose a combination of the two approaches
If a dispensation is to be considered and be accessible, the Holy See would grant an indult to the Bishops of Nigeria to grant the dispensation on a case-by-case basis.
The most convenient way is for the priest to be present at the payment of the bride price.
The canonical form is a merely ecclesiastical law and not a divine law. In other words, it was established by the ecclesiastical authority and not by Christ himself.
Customary marriages are not contracted for ideological or practical reasons or in rejection of Christian marriage.