b]FYI[/b]
1. Seller/operator does not see the buyer’s face.
2. Buyer does not see the seller’s face.
3. No surveillance cameras or face exposure.
When reading this your op post, what mostly caught my attention is this three highlighted statement here, first and foremost you need to understand that this is a financial transaction, and it's very important for surveillance camera to be in place in case of any security breach, secondly, this your public Bitcoin kiosk of a thing is not going to work in the country because our government is not fully committed in crypto related activities.
How will you feel safe if you are buying or selling something to someone that is on mask?
A Bitcoin ATM would be much more better than this kiosk that you are talking about, and for that to be in place in our country, the government must the the brain backing it, but due to how hostile they are towards crypto right now, I don't see that happening soon.
But if our government can be more crypto friendly, I believe that the Bitcoin ATM will bring more awareness about Bitcoin to the general public in no distance time.
I don't think the Bitcoin Kiosks initiative in Nigeria should be welcomed for now due to security reasons, the security issues in our country currently is alarming and since Bitcoin is scarce you could imagine what impatient people who can't buy and hold for long-term, I mean hoodlums and robbers would to those operating in the Kiosk, if robbers could raid banks in urban areas you could imagine what they discover Bitcoin Kiosks.
There's this topic I came across in Beginners and help board, concerning a crypto exchange ceo's daughter that escaped kidnapping
https://bitcointalk.org/index.php?topic=5543371.msg65380256#msg65380256, you could imagine the fate of those operating the Kiosks when kidnappers realize they can kidnap them and take their Bitcoin or demand for Bitcoin as ransom, local exchanges advertising about bitcoin and installing Bitcoin ATM's is even more preferable in trying to encourage people concerning the use of Bitcoin.