"If I have one limb with more reflex can I have a balanced bow that looks right at brace and full draw?"
Maybe. Maybe not. If the handle is kept straight/level, how much difference is there in the limbs of your stave? 'Looks right' is subjective. Forget 'looks right'. You want a bow that ACTS right. So the questions should be...
A). If I have one limb with more reflex, can I have a balanced bow that acts right? B). What would it look like at full draw and at brace height... after balancing?
A) Yes. It can and should be balanced to act right.
B) How it would look after being taught to act right, after balancing and good tillering, like other bows, depends on limb unbraced profiles, center and fulcrum locations, etc. Additionally, with bows like this, the limb with more reflex will 'appear' to flex less in the reflexed area and seem a little stronger overall than it would otherwise at both full draw and brace. It may not be, in either instance. But it will appear that way.
"Can I achieve this(lookin 'right' at brace and balanced at full draw) by putting the reflexed limb at the top or bottom?"
Only if your previous straight bows that 'looked right' were never truly balanced. Since they're different, if the tiller measurements are made to be the same, if either is right, only one can be.
If a straight bow looks a certain way at brace after being balanced at full draw, what makes us think a bow with one reflexed limb, after being balanced at full draw, would, could, or should result in the same tiller measurements or profile at brace? Sure, you could make the tiller measurements the same at brace, but is it 'right' at full draw where it really matters? Is either one? How do you know?
What if one limb was reflexed and the other was deflexed? Make it look 'right' at brace too? I'd be afraid to let the string go of that thing.
I know it's tempting, but don't try to predetermine/guess how a bow will balance at full draw by making it measure or look a certain way at brace. I balance mine all the same way. Some end up positive, some negative, some even.... but they're all 'right'.
For some reason, this is a big hurdle for a lot of folks when it comes to making wooden bows. They want their bows, regardless of their differences, to look a certain way at brace, and basically all the same... with a slightly stronger lower limb, for instance. Probably because that's what they've been told, it's familiar, seems better/easier(it isn't), and it's perhaps their only beacon during the process. Unfortunately, that's probably not how they're going to make their best bows.