Will try to address why (I think) this is not a good idea in the short term.
Important to note the debate is about form, rather than ability.
Especially so in international football.
There is very little time to build chemistry. So when you find something that works, it is often not advisable to disturb it if you can avoid it.
Both have strengths and weaknesses that meld and flow together.
Ekong is quick, aggressive and impetuous; Balogun is slower, methodical and considered.
That dynamic changes altogether if you bring Omeruo in.
Paired with Ekong, he would have to be the leader. This is not a role that suits him.
But without this natural separation, you need to dedicate more time to drilling defence. Time is not a luxury that Rohr can afford right this minute.
Balogun is the other side of 30. Naturally, the prospect of replacing him will be broached soon anyway. No point to rushing into it.
That way, he'll either have time to drill Ekong and Omeruo as a pairing, or...
That's my view on the matter.
The last time Ekong and Omeruo paired in defence was in 2016, in a World Cup qualifier away at Zambia. Omeruo did not have a very good game, and that's putting it mildly.
Infinitessimal sample size, I'll grant.