Uploading Lossless Textures to Beta Havoc Grid

I use SL Image Upload to upload lossless textures (for sculpting maps). However, I like to use the beta grid to test my textures in a Second Life environment prior to importing the final revision of the texture. The problem is that I cannot use SL Image Upload to upload to the Beta Havoc grid. Is there a way to do this other than the lossy built-in uploader? Thank you in advance.

-EDIT-

Oh, blast.... My problem focus has changed so gradually that I failed to realise that it's no longer a building issue and not meant for this board. That's what I get for trying to do things just before I go to bed... I guess being unable to delete posts is a way to have a life lesson that involves making a fool of one's self....

I wouldn't worry about it, the Building Tips forum is basically the Sculpted Prim forum too. Unfortunately there doesn't seem to be any sort of parameter to choose which grid SLImageUpload connects to...

Thank you. Are there no alternatives? I hope the Linden programming staff re-enables the lossless compression when uploading (if true lossless conversion is what that feature allowed).