Do you love big bluegill?
One of the problems Ive encountered is it is hard to find spoons that weigh less than 1/8 oz. It is generally accepted that only the largest brim feed on small fish with any regularity - which spoons are designed to imitate. SO that is in your favor... this pre-selects the largest brim for you.
But finding spoons small enough to fit their nickle sized mouths is a problem. Everything I see looks like a juggernaut compared to a brim. So I have a rule of thumb for this: if it looks small - it's too big. Keep looking.
One thing you can do is haul out your ice fishing jigging spoons, especially the flutter spoons. Look at the ones I've shown here:
Some people call these "micro spoons." I got em off ebay for a few bucks. This particular bunch are "kinda weedless" wobblers, which can be fished slowly. That is important - brim are not big bait chasers, like other predatory fish. They are more ambush oriented.
Try hooking a small strip of flayed belly skin from a juvenile brim on a spoon like this as a trailer, and tease it around weed edges near deeper water. Just enough of this skin to look enticing. Pull it along and stop it, letting it flutter. Twitch it a little and repeat as necessary, attempting to imitate a wounded baitfish.
I dont know if this will work; Im thinking out loud here. But if you think like the fish, you stand a better chance.