[delphi.com.ar]

No me agrada mucho, pero te escribí esto:

Código Delphi [-]
unit TimerRegularProcedure;

interface

uses
  ExtCtrls;

type
  TRegularProcedure = procedure;

  THackTimer = class
  private
    FTimer: TTimer;
    procedure OnTimer(Sender: TObject);
  public
    FRegularProcedure: TRegularProcedure;
    constructor Create;
    destructor Destroy; override;
  end;


var
  HackTimer: THackTimer;

implementation

uses
  Dialogs;

{ THackTimer }

constructor THackTimer.Create;
begin
  FRegularProcedure := nil;

  FTimer := TTimer.Create(nil);
  FTimer.OnTimer := OnTimer;
  FTimer.Interval := 5000;
  FTimer.Enabled := True;
  {...}
end;

destructor THackTimer.Destroy;
begin
  FTimer.Free;
end;

procedure THackTimer.OnTimer(Sender: TObject);
begin
  if Assigned(FRegularProcedure) then
    FRegularProcedure;
end;

procedure TimerEventos;
begin
  { Tu código}
  ShowMessage('Hola Mundo!');
end;


initialization
  HackTimer := THackTimer.Create;
  HackTimer.FRegularProcedure := TimerEventos;

finalization
  HackTimer.Free;

end.