Selector compatable command?

The Problem:
I use minecraft's built-in scoreboard system and selectors for a number of features on my server. Before you get mad at me, I must ask that you not criticize me for using the built-in system. All I need is a command similar to /execute, but doesn't execute from the console. Yes, this does sound impossible, but I only need this to work for certain players, such as @a[tag=Test] (All players with "Test" tag, or @a[score_Test=3] (All players with a score of 3 for "Test".
The Requirements:
The command could be called /executeplayer, and the syntax can be the same as execute, although the coordinates are not required.
The syntax for /execute is:
/execute <selector> <x> <y> <z> <command>

I hope this isn't too much of a problem.

EDIT: Forgot some information
Version 1.12.2
Permission Node: cmd.executeplayer

 

Soo.. you need a Command that doesnt execute from a Console.. From where/whom then?

 

The player. The selector dictates which player to execute it for, though