I'm sure everybody is mentioning Jens as a replacement, because that's the way football works and he is flavour of the month.
There are plenty of other managers that play the same style, so it shouldn't be difficult to recruit one of the hundreds that implement the same philosophy.
Elliott Watt has played for Wolves, Carlisle Utd, Salford City, Burton Albion and St Johnstone, and I heard him in an interview saying every one of those teams (including Carlisle Utd) had managers that played the same way - which is why he found the transition to be straightforward.
If Carlisle can find a manager to implement it, surely Celtic or Aberdeen can find someone too. It would be ironic if they want to implement something progressive by following the well worn path of poaching a rival boss.