Flyback booster: Land in Africa, mount jets

In another thread, flyback boosters with jet engines were mentioned.

Why do they keep including these jet engines before launch ?

They have no function until the flyback.

So dimension the craft, so the booster lands in Africa.

Mount the jet engines there, plus perhaps an extra set of wings, then
refuel and fly back.

Come to think about it: For recoverable 1. stages of the ROMBUS style
type, again land in Africa after sending 2. stage on it's way.

Fit a new nose cone, refuel and fly back.

That's my idea of a fly back booster.

Both ideas allow for vehicle check out before returning, and you avoid
designing ships or special planes to retrieve.

Come to think about it, how about landing in Africa, mount another 2.
stage + payload, and land in ??? I've got to check out if there is a
place to land and launch the 3. time. And perhaps the 4. time, landing
at KSC.

Regards

Carsten Nielsen
Denmark