No, and it's really disappointing. They purposely made the game moddable but left us no way to change the backgrounds without totally ripping their code apart. I did a collection of mods for unconverted STEAM but I must be honest I couldn't actually play that way, it's part of why testing that package is so difficult. There is really no reason to stay on the CLOUD unless you're a purist and it's a goal of some sort.
I gotta say, though. Troubleshooting reports for bootleg have dropped off.
GameConverter9b handles STEAM like a ball of yarn now. If you were having trouble before with converting STEAM, this new version of GameConverter should take care of the dirty work. It's now possible to completely move your STEAM installed Final Fantasy VII folder and put it wherever you please outside of the Program Files area, and then convert it. Right now I have a converted version I play with, and a STEAM version I use to test both installed on my system. The only twist (if you could call it one) is that you need to manually type in the filepath for where you moved your STEAM FF7 folder during the conversion.
I asked Omzy personally about the idea of making a huge flevel.lgp file with upscaled backgrounds in it, and his answer was complicated enough to mean it wasn't going to happen. In theory, it's possible, in practice, it would be sort of a life's work. Bootleg has all kinds of mods, some of which are actually included in the HQModels for STEAM package. You can install it and then put Kaldarasha's models on top, which is really all that HQ STEAM package is, minus the things that are incompatible, like world map mods and menu mods.
In response to some PM activity I've received on this subject I'll let Omzy explain it in his own words, because this is out of my comfort zone. To be totally clear: I am personally not capable of doing all this would require, physically or mentally, not even for 1 scene. Hope its cool to post this PM, I am almost certain he would approve.
Heya Template!
I'm not sure it can be done. This information is far from fresh in my head so pardon the laxity. The import feature of Aali's Palmer turns the textures into nice little compressed bundle textures that his driver reads (the files that are distributed with the field pack). His driver was specifically designed to understand an increased number of palette colors (larger palette size) in addition to the higher resolution. The palette sections of the field file would need to be rewritten to observe this, in addition to rewriting segments of the field file encoding the length of the larger textures. Even if this were all done without a hitch, I'm not sure the kernel itself would be able to understand the headers of the modified field files. Kernel editing would be above my level of ff7 knowledge and a dark area of programming I have yet to delve into. If, however, you think you can shimmy around these limitations, you have my full support 
Omzy
Just goes to show how awesome the guy is. Seriously I wouldn't even make political criminals do this process and I certainly wouldn't ask Omzy to do it. If this is going to ever happen, it will have to come from some super talented person who can verify that the kernel headers will work after doing a test scene. And then, assuming they could make that scene work, changing aali's Palmer tool to accommodate the format needed for encoding into the lgp file. That would be a year's worth of toil, several hours a day I think, and the person would have to start out with knowledge few people alive possess. There's no guarantee that there wouldn't be massive problems we haven't considered somewhere along the process. If you want to see how totally bonkers this stuff turns out... just look at the actual .png files Omzy's Field Pack installs. They look like quilts from the 19th century.
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Obviously will only work with LGP type mods, since there is no Aali driver, PNGs etc. won't load.
So copying that over may help.
But it's pretty unusual to have 2 versions of the game installed I suppose.
