I would say that is doubtful that all addresses could be pronounced. I was under the impression that in the original movie universe the symbols represented constellations, but that would not make sense if the ancients could foresee and plan for stellar drift. If they were letters of the ancients' alphabet then I find it very unlikely linguistically that all addresses make up readable names.
One explanation for this though could be that the gate symbols were like consonants and the vowel sounds were just sort of made up or accepted convention. An example of this can be seen in a modern biblical scholarship debate:
The ancient Jewish scribes that recorded much of the old testament used the letters yod, hay, vav, hay to represent the most sacred form of the name of God. In English this is often abbreviated YHVH and is called the tetragrammaton. One of the big problems this made for the modern Judeo-Christian scholars is that we have no way of knowing how this was originally pronounced. This is where both of the pronunciations YaHWeH and JeHoVaH come from. Because there were no vowels in ancient Hebrew we are left to guess, but these are two accepted pronunciations for a word that technically isn't readable.
My point is that it could similarly have been possible that only some of the sounds in the word proclarush may have been represented in the accepted pronunciation. This is definitely a case where suspension of disbelief is required, because based on the number of gate symbols and possible combinations, we would have a far greater number of gate addresses than there are words in the English language. It's quite unbelievable to suggest that those all formed proper words in any humanoid spoken language.
I won't even start on the whole English-speaking universes thing, cause that's a whole different can of worms.