Just taking a cursory look at your plan, I would say you're better off mining something that gets a better yield (like BTC, LTC, or ETH) then using that to purchase Steem/SBD.

To get FREE SBD and STEEM POWER. Take some time to read other people's blogs. Write thoughtful comments and then write about your passions. This will earn Steem Power and SBD far faster than you can mine it (even if you are running your own witness node)

Also, I use Nicehash for my Cloud Mining (check it out)
Mine for yourself with Nicehash
Or sell your hash time