I think KEF provides port plugs for all of their range of ported speakers. But at the same time releasing a product that will statistically be preferred less by everyone because of the reduced bass extension and fits awkwardly in their lineup will not happen i'm afraid.
The R2 is indeed the best option in this case.
Agree. A R2 or port plugged R3 aren’t optimized for flexible mounting. In a world of multichannel, having more options is helpful when putting together a system.