1) The absolute best way is jus tbuy something cheap and contact the seller BEFORE you buy and pay and tell them you want it shipped to a different address.
If they agree, then you're good to go. This usually won't work on high ticket items obviously.
2) I have used my real shipping address in ebay have not been linked yet.. but i emphasize YET we will see if this account gets suspended for being linked, so far so good.
3) I have "bought" feedback in the past and have not had issues. I know this way is not favored on this forum, but if you buy 5 feedback over the next 3 days or so , or 1 a day.. you should be alright. Just don't go over board buying like 20 FB's to get a ebay store then start selling high ticket items haha
4) You can just buy crappy items and have them sent to the ⊗⊗⊗⊗ address..the concider it the cost of doing business.
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Ultimately, I think it's best to have just 1 buyer account that is solely used for buying stuff on ebay. And multiple multiple seller accounts  | 
