How to WIPE without CWM / NO recovery / only download

Hey guys.

I have been doing a lot of researches before creating this new thread.
Here is my problem with a Samsung Galaxy s3 I9300T (Australia - Vodafone build). I was given the phone, since it was stuck in a boot loop after a software update issue with Kies (I think from memory 4.2 or something).

The phone boots up, displays the Vodafone logo, and is stuck on the Samsung logo. The phone doesn't restart but stays idle there.

It is impossible to reach the download mode with the use of the 3 buttons, but a USB JIB I bought on ebay does the trick.
Odin recognizes the phone, I can flash a stock Kernel from Samsmobile or root/install the CWM.
BUT, there is no way (so far?) to reach the recovery mode.

I tried to flash a new boot loader, tried to check any physical issue with the buttons, but nothing seems wrong.

I have been looking for tools such a android toolbox/toolkit etc, in the hope one would be able to wipe/flash the nand or even unbrick or whatsoever, from a download mode and not ADB, since I there no fast boot available.

I am ready to try anything, since there's nothing to loose here.
I'm running windows 7 from Parallel desktop.

Thanks mates.
Anthony