And how would you try to express something which is outside of our own possible experience? Sure, you could say "eternal present" or something; doesn't seem to sound much better...

I wasn't picking on your choice of words. If there is an ever-present something which effects our universe, and there is change in our universe, then there must be change in that ever-present something's universe, right? I mean, I suppose you could look at our universe as just a const 4-dimensional chunk of data with us simply moving along the time axis, but us moving along it is still change.