Greetings to you all...
The issue of pronounciation is one I've stopped worrying myself about. One reason for this is that many of the names used in the spiritual sciences are
very old and in many instances from dead languages. Even where they aren't, knowing how someone said something way back when, becimes conjecture anyway, unless they left instructions. Then there is the seemingly inevitable corruption due to myriad things that occur over time through human error - or just the human factor, such as differing tongues, cultures, times, etc... For example, I was born in Norway of South African parents and have lived many places. My name gets pronounced very differently by different people in different places. This used to frustrate me at times as a kid, but I came to accept it and now I don't care. Now, Mei Ling from Beijing and Connor MacDougal from Glasgow and Hector Sifuentes from Havana and Sipho Dlamini from Durban, would give very different renditions of nearly anything you gave each of them to say - e.g. a performance of LBRP. People pronounce the Enochian words and names in many different ways and still get blasted with powerful energies.
Jeejee, say tomatoe. Now, Iron Orchid do the same... see..?
I believe that these outer things are secondary to the intent of the practitioner. If you call the archangel Michael and pronounce the name as anyone would or if you approximate the way an Israeli would say it, you'd still be calling the angel if that's what you're set on doing.
Myself, I follow NAP as G.G.C. wrote it - I differentiate between the middle pillar ritual classic and the gates of power of NAP. The NAP bornless isn't the same thing as the bornless classic IMO. In this, I've taken the lead of those more expeienced than me (I'm quite the noob).
I'll never knock reaearch and the inights it can yield, but I downplay the importance of pronounciation. I think it's more important to be consistent once you choose a way of saying something.