I Would advise B3 to consider economies of scale first, before embarking on costly 737-700 acquisitions/leases. Why not get good rates from GECAS on 737-300/400/500s. Get 10+ of those and really boost frequencies and widen the network, to feed/complement long haul flights. It can become a sort of private ET-type carrier in West Africa, competitive product for competitive prices. Innovative+daring routes.
Also Bellview is badly in need of a foreign technical partner. SAA perhaps, maybe LH or BA. Not happening before Bellview takes professionalism to the next level.