I'm new here and I assume that it might be weird to have souls in a science-fiction question but hear me out. While souls in my setting do have some magical unexplainable supernatural properties, it isn't what I want to ask here, this question is about the physical consequences of some properties I'm giving this set up.
The Soul Field:
I created this field for souls to connect to or reside in, it is an objective reference frame field, where time always ticks at the same rate and space is compressed to a single point. Regular physics do not work there, of course. The Soul Field can gradually transition to regular space-time in the material universe, where physics should be realistic, dictated by relativity and so on. All points in this gradient would map to the slices above and below in order to keep the smoothness, meaning that eventually all points in the universe map to the same, single point of the Soul Field. I decided that the clock rate of the Soul Field should be similar to the CMB frame, since it is the backdrop of the entire universe.
If I'm not missing something, the Soul Field is instantaneously accessible anywhere in the universe, and from an information perspective, the universe would appear to shrink as it climbs the gradient, allowing for messages to travel faster and faster until they become instantaneous at the Soul Field.
Due to the requirements of my setting, I need communication between souls to be possible, even if one is in the afterlife and the other isn't. In the Soul Field this is trivial, since relativity does not apply there, and since all points are the same. But anywhere closer to the material universe, I expect problems due to general and special relativity making souls perceive time at different rates. The way I tried to fix this was by having the souls move up the gradient, closer to the Soul Field, and send the message in that way, minimizing the effects of both relativities and allowing for faster communication (interpolating between lightspeed and instantaneous depending on how close to the Soul Field they are).
The problem is that my brain is getting stuck thinking about how that would look like for living beings, trying to shift their frame of reference to align with the Soul Field (CMB frame), but without really changing how they move from the outside (this would be bad). One restriction that I already have is that two souls that are in the material universe cannot shift to eachother's perspective directly, in order to obtain maximum alignment they must both be as close to the Soul Field as possible. They can only adjust between their own frame of reference and the Soul Field, knowing that the Soul Field is the same for everyone.
What is the best way to interpolate between a given relativistic frame of reference and an OBJECTIVE frame of reference? And at the risk of breaking the rules: Is there a better way of doing this? (ignore this if I shouldn't be asking it in the same question).