Scrambling up to grade II at Hochseiler.
There was a direct path from Teufelsllöcher to Hochseiler via the glacier, see https://www.alpenvereinaktiv.com/de/tour/hochsailer-2793-m-am-hochkoenigsstock/10054802/ or https://www.hikr.org/tour/post26267.html
However, the route is essentially no longer possible in non-winter conditions (rockfall, melting steep glacier) and would be suicidial. please use only the normal way from North to Hochseiler and traverse the glacier on the bottom (Herzogsteig, with spikes and helmet due to rockfall).