I think its a good idea, especially for Australia. Mahmood is a good selection. Its clear the bowlers are lacking half a yard of pace. Thats fine, they'll still be very useful in English conditions. Not sure what can be done about the batsmen though?
Australia haven't won in England for 20 years either, but it's obvious they are much closer to winning here, than we are winning there.
Given how crucial the opening role is, I think it needs to be looked at as a specialist job. Arguably top 3 should be selected for conditions, same as the bowlers are.
Batting wise, it's failure to grit it out that is causing problems. Select three openers suited to conditions and who have shown the technique and mentality to bat long, stick them top 3.
Foakes at 7, not just for his keeping but because he looks to have far more of a natural test match mentality than Buttler.
Start looking to introduce openers with solid, repeatable technique. I think Burns has shown he's another one out the Ballance book - outstanding county player, mediocre at test level because of technical issues he won't correct.