First of all, welcome to the forums!
Now, there are problems with the route you chose.
The big thing is you can't use it, because the only reason the Coin Case glitch works is because of a translation programming error.
Read more about it here.
http://forums.glitchcity.info/index.php/topic,6716.0.html
The box names are also for RTA gold glitched, which would take longer than the current TAS route (you would need to buy x specials in Goldenrod, use them, go back to goldenrod and then go to the poke center)
Running on Japanese Games would take away the entertainment because some people wouldn't understand what the text would say and running Japanese versions for faster text is not a good notion to hold.
Also, since Japanese characters have different hex values than the english letters, you would need to write a whole new program.