Adding 26 locations with dual redundant IPSec tunnels - OSPF vs. BGP

Hello all,

We currently have 26 locations on private MLPS. We will be installing standard internet circuits, as well as a backup cellular connection via Fortiextender.

I want to do a Hub and Spoke configuration; in the past I would simply create an IPSec tunnel over each interface (Primary and cellular backup), and then do OSPF cost based routing for redundancy. (Cellular tunnel would have a higher cost)

However, it seems that my 200F (hub) can only support a maximum of 10 OSPF neighbors. (https://docs.fortinet.com/max-value-table) I would need to add 52 (26 sites, two tunnels each)

Should I be going to BGP instead? If so, how would I configure redundancy between the two tunnel interfaces? I've only done OSPF in the past.