Well pal, i'm doing the exact same thing
Runned on this problems myself and you have 2 options
1.- Either stick to J2ME, BB run perfect on that platform, no changes needed to be. And you could deploy the application to a wider range of devices, not only BB
2.- Get rid of all the J2ME and focus on BB API. that what i'm doing and really, it takes a lot of effort and work, but its paying beatufully. My end user were complaining of the lack of buttons and a lot of use of the menu, so the BB API was pretty helpfull here. I'd had been able to make my own button, yes (My nokia 3500 has buttons, but can't fins those on the J2ME api so i'm pretty sure those are custom made items) but BB saved me a lot of work.
Still, calling the pushscreen should be enough to call paint the things, can't think of a reason why it won't paint the screen with the info
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