That's what I did. The problem I'm having is that the derived addresses and keys are not correct.
On standalone
I'm entering my 12 words in BIP39 Mnemonic space
Im choosing bip32
Im choosing multibit hd
You have to set the bip32 tab first, then choose multibit, then put in mnemonic code, if you use wrong sequence it will give wrong output. Shut the page down, and restart it if you took the wrong sequence or it will give failed answers.
ps I sent BTC on 08-01 at 4.02am, BTC arrived but the address is not showing up in mycelium's BCH addresses at all with the above method, the one with 4 and 3 BCH did, but the 0.028 BCH are in a BTC address that is visible in Mycelium itself, in a BCH explorer, but nowhere else. Lost I guess, but no big loss