Hi, with trapped you mean you sent them colored coins to addresses in the wallet without a fee high enough to transfer them out?
How is this a problem with MultibitHD? MultibitHD doens't allow you to export your keys because it's kept simple to help most users manage their funds and not break everything.
If you want to keep your funds in a private key that you can see, you'll need to send money to pay the fees to wallet and then transfer out to Electrum, which allows to export, or cold storage addresses.
Originally I funded purchases of these tokens from BTC in my Multibit Wallet, and the distribution of the colored coins defaulted to the same BTC address from which I paid. I never held these tokens in any other address. But as I mentioned the BTC amounts on which they appear to be piggybacked are too small to meet the BTC-based fee hurdle of transferring them out, which i was not aware would be a problem when I made the original purchases. I would gladly transfer them out at very low to zero fee even if that meant confirms took a day or more, but I dont know if this is possible on Multibit, or if its possible to see the private key to use in an alternate wallet, or if there is another solution.