I like Doc Brown's idea.
I was also thinking how about a lottery where every lotto team has the same % chance of getting the top pick.
That would still kinda work in trying to level the playing field (only bottom teams have access to lotto picks) but it removes the incentive seriously tank.
I think teams would try to play as well as they can, knowing that they still have the same chances of getting a top pick (assuming they miss the playoffs), so they can start building and shaping their teams even before they draft - not trading away any good players / messing around with unbalanced lineups / not trying to improve key things in practice just to suck bad enough to draft top 3.
That way, Wiggins or whoever doesn't end up in a seemingly intentionally terrible (and unready for real, quick, new-talent-coming-in improvement) Philly team, but a team that is figuring out which players can play, how the offensive and defensive systems should be improved, what are the key areas that need to be worked on, etc.
"The first time I ever saw my uniform hanging in the locker I put it on right away, and it just felt like I was putting on golden armour. From that day forward, I just called it 'the golden armour', it just felt like there was something mystical and magical about it" - Kobe Bryant.