I've bought quite a few things from KEH, and returned a couple for various reasons. Excellent company to deal with.
Every transaction was smooth and professional. Refunds are prompt, usually the day they receive the item.
I haven't bought anything on the bay since they implemented the paypill requirement, and never will as long as that's in force.
Definitely go with KEH.
To answer the OP's original questions:
1. Doubtful. They offer complete camera 'outfits', which include lenses. I doubt they would make up a special outfit, but doesn't hurt to ask.
2. Their grading is quite conservative. I've always bought EXC or better, and the items all look virtually brand new.
BTW, the no-questions-asked refund policy period is 14 days, not 7.