1. I have heard, and seen on the UAE Ministry of Labour
(MOL) website that the ban lifting fees are AED 500 for each month short of contract completion but check with the labour department for up-to-date information.
2. I don't know about a law that says you can transfer to a new sponsor easily if your salary isn't paid for two months by your original employer. I think the law says you can leave without notice if your employer does not fulfill their legal obligations for example not paying your salary, however, by filing a complaint with the MOL, they might look more favorably on a subsequent transfer request without an NOC, and perhaps lift the ban without requiring fees. Perhaps the two month unpaid salary information is a guideline they use. Or it could well be an amendment to the labour law. Check with the MOL for official information about that.