Plus, it would work better than most converters (ie: no Arcade Card problems)...and you can close the HuCard door. Awesome!
What's the problem with the Arcade Card and converters? I've been using a Kisado/AC setup for ages and never experienced any problems.
You won't have problems with a Kisado. Which is presumably why people spend so damn much money on them.
If you are using the "TV Game Converter" one games like Mad Stalker and Sapphire will screw up on you. Also, the TV Game Converter won't actually fit in a Duo without some hacking. By "hacking" I mean physically hacking away at the plastic with a knife.