Bradman was famously a 'non walker'.
I'm not an opener and have no interest in opening. However in the league games I've opened in I've scored 40+ every time (at a SR of 80+) against decent opposition. So, I don't think at the lower level it's as specialist as openers like to make out. I do think it's a different mental process to batting at 3/4/5/6. Nothing more.
Sorry my mistake after watching your batting videos I thought you were just another village cricketer.. Not that there is anything wrong with that.