There is no way to run GBA games without that RAM, so no additional programs will fix it. If you want GBA support, get either an M3 Perfect (very expensive) or the Supercard bundle you listed. The problem is that the Supercard has some slowdowns due to slower RAM, so you may want to check a compatibility list online before purchasing anything. For DS homebrew though, both cards would work about the same.
I personally have a Supercard MiniSD, and I've been satisfied with it.
It might be cheaper to just get the device and passthrough and then buy an SD card at a local store. RHS seems to be charging an extra $30 for a 1 GB card, and I know you can get larger cards for a cheaper price if you look for sales. I personally got a 2 GB miniSD card for $20 on Black Friday.
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