Wool works over any nappy although prefolds are tricky as the wool is too stretchy to hold in place. I find bamboo is best underneath wool, and MF the least effective. Natiral fibres seem to work best. Most wool covers come pre-lanolised when bought new (although Disanan ones aren't) , but will need re-treating every so often. But treating with soluble lanolin instead of solid lanolin is really easy. You just add some soluble lanolin to warm water and leave to soak - similar to using a fabric softener, except you need to soak for a few hours. It beats all that messing about with melting and emulsifying the lanolin before you can soak.
Yes. It's new, but dramatically easier than lanolising any other way, very economical, and can be bought in ready measured dose sachets, or in bottles with a measuring syringe. Try ebay;)