I actually did this for someone as a private request not to long ago. The concept is a little different though, it warns the player and if after x seconds they don't change it, it will change their name to one from a list. If this works for you, I'll throw it up add the steam id usage as well.

i made this long ago, it will show "Player" that theres a chat command called /name and that command will show a motd that has a guid for how to change there name.. You will need a file called name_help.txt in the root folder where e.g server.cfg is found, with info about how to change the damn name...rnrn

#include <amxmodx>rn#include <dodx>rnrn#define PLUGIN "Client help"rn#define VERSION "1.0 by Dr.G - www.clan-go.net"rn#define AUTHOR "Dr.G"rnrn//FILErn#define HELPNAME "name_help.txt"rnrnnew p_onrnrnpublic plugin_init() rn{rn	register_plugin(PLUGIN, VERSION, AUTHOR)rn	register_cvar("client_help_stats", VERSION, FCVAR_SERVER|FCVAR_SPONLY)rn	p_on = register_cvar("client_help", "1") //Plugin on/off | 1=on 0=offrn	rn	register_clcmd("say /name", "NameHelp")rn	register_clcmd("say_team /name", "NameHelp")rn	rn	if(!file_exists(HELPNAME))rn		set_fail_state("[Client help]name_help.txt does not exist!")rn}rnpublic client_putinserver(id)rn{rn	new name[33]rn	get_user_name(id,name,sizeof name -1)rn	rn	if(equal(name, "Player") || equal(name, "(1)Player") || equal(name, "(2)Player") || equal(name, "(3)Player") || equal(name, "(4)Player") || equal(name, "(5)Player"))rn		set_task(10.0,"ShowMsg",id)rn}rnpublic dod_client_changeteam(id)rn{rn	new p_name[33]rn	get_user_name(id,p_name,sizeof p_name -1)rn	rn	if(equal(p_name, "Player") || equal(p_name, "(1)Player") || equal(p_name, "(2)Player") || equal(p_name, "(3)Player") || equal(p_name, "(4)Player") || equal(p_name, "(5)Player"))rn		set_task(5.0,"ShowMsg",id)rn}	rnpublic NameHelp(id)rn{rn	if(get_pcvar_num(p_on))rn		show_motd(id, HELPNAME,"Help screen | Name change")rn}rnpublic ShowMsg(id)rn{rn	set_hudmessage(75, 223, 179, -1.0, -1.0, 0, 6.0, 30.0)rn	show_hudmessage(id, "Need help Changeing your name???^nSay /name in chat to see how to!^n^n Cheers!")rn}rn

<html>rn<body bgcolor="#303020" text="#c1b689"> rn <p>rn<font face="Arial">rn<h3>CONSOLErn<hr>rn<h4>To open your console press ½ or § its the same key! Right below Escrn<hr>rn<h3>NAME CHANGErn<hr>rn<h4>Open your console - Type: name "newname"rn<h4>NOTE if you want spaces in your name use % where you want the space to be!rn<h4>I.g. name My%New%Name will set your name to "My New Name" rn<hr>rn</h4>rn</body>rn</html>

cool.. let me see what you end up with :)

OK, I've put it up here: https://www.dodplugins.net/forums/showthread.php?p=12491#post12491