End of draft strategy?

10 man PPR 1-keeper(8th rnd or later) with no draft restrictions. What are your thoughts on not drafting a K(yes we still use these, i know), DST, or even QB, but instead, drafting players who might be worth a keeper for next season? Only drafted players in the 8th rnd or later are eligible to keep. I would then drop my last 3 picks and pick up my QB, DST, K for my starting lineup. I would then be able to pick up those 3 picks sometime during the season to hold for next season. Now obviously there a couple obvious pitfalls in this strategy: 1) You have to pick the right guys and 2) you have to pick them back up before someone else does. What are your thoughts on this strategy?