And because not all my Loremasters are Lv 25+ ...
I would think any Loremaster (i.e. not journeyman or student/apprentice) would be at least 20th level and likely "Loremasters are Lv 25+".
That leaves the questions of what to do about journeyman.
As previously mentioned, a journeyman would be operating in the vicinity of a Loremaster, perhaps being sent away for a day or two at a time.
And a student/apprentice would be even closer.
What about the Mentalist "Prepare Mind" series which increases the range of an incoming Mind Tongue spell?
With planned contact times, this greatly increases the range of communication.
For example, 14th and 17th level "Prepare Mind" increase range by 500 and 1,000 times, repsectively.
The 10th level Mind Tongue spell then has a range of c. 95 miles or 190 miles.
[I think 10th level is the lowest level I could see for a Journeyman Loremaster).
At 18th level, Mind Tongue has a [base] range of 1 mile.
So pre-planned communication between two individuals, one who casts a 17th level spell and one who casts an 18th level spell, could be done at a range of 1,000 miles (18th level Mind Tongue IV has range of 1 mile and 17th level Prepare Mind True increases range by 1,000 times).
Higher level individuals can increase this even further:
The 25th level caster uses Mind Tongue True (basic range if 1 mile per level or 25 miles at 25th level).
The 17th level caster uses Prepare Mind True (increases range by 1,000 times).
They can - with preplanned communication times - communicate at a range of 25,000 miles; i.e. each can be
anywhere on the planet.
So that's one method for Loremasters achieving the range of communication needed.
DonMoody