I like you, came over from AAT to ICB and I haven't looked back. There's alot of support and resources available and some really great events where you can network and gain industry insights - we ICBer's are a friendly bunch!
The ICB do offer membership by exemption based on experience too, not just examination so may be worth checking this out too.
For myself, I advocate Training Link who have been immensly helpful in supporting me in gaining payroll and self assessment passes in the high ninties, you do also have the option to self study without support as you can buy various workbooks online from the ICB shop and Amazon too. I did this for the Level 4 in Advance Bookkeeping and Accounts.
Maybe have a chat with the ICB directly, i'm sure they will be more than happy to provide information on the best route to membership.