What team without Grievous should I farm and gear to unlock 7 star Padme in 1-2 months (next return)

Is it realistic to think I can 7 star Grievous from fleet alone (currently 131 shards, not activated) - no shard store - by the time Padme returns?

There seems to be no consensus on what to get for this except B2. Also there's conflicting advice on Dooku and Sun Fac. Some people are recommending them, but Woodroward is saying avoid them (btw you said Dooku twice).