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You can include a bitmap blit on the Window_BattleStatus contents (i recommend on rewriting the refresh method) and comment (or delete maybe) the following lines on Spriteset_Battle so the actors' battlers won´t appear on the screen:
Sorry that i´m not presenting a script that solves your problem through the usual copypasta, i just don´t have time now to do so :/ I´m sure someone else will help you in no time.