I was facing a similar problem. After looking into it, there are not any drive-chips that will work on a D3-2 system.
There is a Wiikey Fusion chip that will apparently work, although this is not out yet, and keeps being delayed.
In the end I decided to softmod my Wii, which I did using messie's guide which you can find here:
This will not enable a D3-2 system to play backups from DVD, but it should enable them from USB and SD although I have not tried myself quite yet.
I hope this helps.