Old School wrote1.) In the absence of no coach and no assistant coach, YES!
For crying out loud. Only the head coach may request a timeout from the bench. (rule 5-8-3) You can't just make up the rules.
Besides that, if you run out of coaches, the game is over.
Unless we're talking rec ball.
Old School wrote
2.) I would just go to the bench and just get someone to replace him.
So you're a coach during this game, too? You can't just make up the rules.
Old School wrote
3.) Charge the technical to the bench and eject the player. Player must now leave the playing area.
Rule reference? Never, never, never, send a player out of the gym without adult supervision. In HS ball, an ejected player does not have to leave the court unless you think he's a danger to the game.