The issue with an accurate representation of a flat earth map comes up a lot. There have been some suggestions.
Personally, I believe it is a closed finite surface in non-euclidean space. This is a mouthful of math terms, but the end result of this is that its difficult if not impossible to create a map of the flat earth, similar to how it would be impossible to map the globe model to paper accurately without use of projections. The underlying problem is the assumption you can draw accurately a very large body in curved space on a very small flat piece of piece of paper and have it hold to scrutiny without projecting it. We already know this isn't strictly the case.
It's basically assuming Euclid's postulates are correct even though we know for a fact they aren't - ignoring what was the greatest scientific revolution of the last 2000+ years. If the earth is non-euclidean and a closed finite space he is essentially asking the impossible.
Want he wants is a map that matches the globe. Its like saying "You believe elephants are gray. I won't believe you about elephants until you produce a blue elephant for me."
All I can say is you still seem to be trying to follow "Leo Ferrari's Theories"[1], and don't yet realise he was playing a joke in the whole notion of a "Flat Earth".
Yes, Einstein concluded that spacetime is curved, but the actual curvature in space is only significant near massive bodies. Even our Sun deflects light a minute amount, partly from the curvature of space, partly from the slowing of time.
I know you would think it beneath your dignity to read such a thing, but this is not a bad read and keeps ones feet on the ground
Gravity: from weightlessness to curvature. It is admittedly pretty low level.
But the earth is a real solid object of a well defined shape! And, I claim that shape has been clearly determined by actual measurement.
If the earth were flat then no projection would be needed. It would be a trivial matter of simply making maps of the whole or a part simply by linear scaling - no great mystery.
The problem is that no "Flat Earth Map" has yet come anywhere near fitting the measurements already made on the real earth.
And, whatever you might claim accurate maps are vital in so many areas. Luckily for those who accept GPS mapping as accurate we have quite precise digital maps to use.
If in my ignorance I have stuck my neck out too far, it will get quickly lopped off - so be it!
So, what about coming down to earth and discussing things in a little less abstract terms?
[1] Eric Dubay (must wash my mouth out with soapy water for mentioning the name) even accuses TFES of being a continuation of Leo Ferrari's "The Flat Earth Society of Canada", not that I put any weight on that or on anything from "dear" Eric!