The crossing of the Kreuzeckgruppe on the Kreuzeck Höhenweg from Möllbrücke to the Iselsberg is a very beatifull line. Over 90 percent of the route are on single trails. Many sections are technically challenging, somtimes exposed. The route follows as much as possible the main ridge line of the Kreuzeckgruppe.
The route should be without snow. Sections like the crossing of the northface of Kleines Hochkreuz is quite steep and rocky.
Find more information and a full trip-report incl. many pictures of the route here (german):