The key thing is designing a CLASH jumper that deals with the clash.
There are two clubs that cause issues with Essendon, thats St Kilda and Melbourne. Getting rid of any white will solve the StKilda issue, mostly red will solve the Melbourne issue, so something based on the Lionbear solution without the white number background would work.
Only wear the clash jumper away when there is a clash, not at all away games.
Disagree.
Melbourne have all-red socks, large red yoke that extends over the back and red collars/cuffs. Overall, you'd say - with socks pulled up - the ratio is 60:40 (blue:red).
Something mainly grey/white would solve that clash much better.
As for St Kilda - red is most probably the best option, though a dark silver might still work to a degree.
Therein lies the problem.