First, disable any RAM checking in the BIOS during powerup....that will shave a few seconds off boot time.
Next, use TWEAKUI and set it so that you get an early boot menu. This way, you will see a boot menu before windows even begins to be loaded. You can manually choose DOS from the menu, or you can set the timer for something short like 5 seconds.
Write a script in your DOS autoexec.bat file so that when MS-DOS starts WordPerfect for DOS or a text editor is automatically run.
This should all happen in under 20 seconds.