That's a fairly easy task...
Your basic steps are fine... and it is good to see that you've done some research, enough to know that MBC's fees can be problematic!
You could do the following if you want to safeguard your BTC, before accessing the BCH:
1) Backup your private keys from MBC
2) IMPORT the private keys into an Electrum wallet (File -> New\Restore -> Import Bitcoin Address or Private keys - NOTE this is different from the youtube videos released by MultiBit devs!)
3) SEND the coins from your IMPORTED Electrum wallet to a different BTC wallet (I'd suggest a "standard" Electrum wallet)
4) IMPORT the keys from MBC into Electron Cash (
https://electroncash.org/#download)
You would then have BTC in one wallet... and BCH in another.
NOTE: At the current moment in time, fees are SUPER low, so it should be fine if you want to use MBC to send your BTC... I sent a transaction this morning with 1 sat/byte fees and it got next block confirmation!
Sorry to drag this up again.
Firstly, thanks for the info above. Really useful.
I finally got around to grabbing my btc cash from an old multibit wallet address. I completed steps 1 to 3 fine.
I then got to step 4 above. But when I try to import my private key into the electron wallet from MBC, the next button is greyed out. This a common issue? I'm guessing it has something to do with the way it stores the private keys?
Thanks in advance