[zgrssd]

After another set of pondering I reduced it to the following KISS case and even added some sanity checks on the input data:

--Use lib stub to figure out if the same or higher version was already used
local major, minor = "LibConstantMapper", 1
local lib = LibStub:NewLibrary(major, minor)
 
if not lib then 
    return
end
 
function lib:getMappedData(pattern, exclude)
    --Sanity check on values
    assert(pattern ~= nil and type(pattern) == "string", "pattern must not be nil and of type string")
    assert(exlcude == nil or type(exclude) == "string", "exclude must be nil or of type string")
    
    local result = {}
 
    --For every entry in the Global table
    for key, value in zo_insecurePairs(_G) do
        --Compare it to the given mapping
        if (key):find(pattern) and (exclude == nil or not(key):find(exclude)) then
            --found a Value for this mapping, so store it in the result table
            local newentry = { key = key, value = value}
            
            table.insert(result, newentry)
        end
    end
 
    return result
end

I will also work on giving you some default pattern/exclusion pairs to work with (propably a "getMaps" and "addMap" function, similar to LibMediaProvider:List()).