I don't think you read/understood my post.
Also, if think brettanomyces is all about striving for 'dense tropical esters' I don't think you understand at all what this beer is about.
Based on what I've heard from Chad Yakobson at Crooked Stave, brett doesn't need left over sugars to create its 'flavor'. Brett will continue to break down things like esters and even alcohol to create those signature flavors. Brett is unstoppable.
You can put them in the oven for about 12-24 hours at 150F, that has worked for me in the past.
** FYI ** - You'll probably lose a couple of bottles to explosion though so be smart about it.
You could.. but what would be the point? Just buy a kit that matches the beer you want to make. It seems idiotic to buy two kits when you could just get one with a higher gravity.