Using a DT 100/480 headband cover will work too as it’s much thicker (likely due to the weight of these headphones). Also you can just slide one earcup up and one down if yokes are loose and it works fine. I have this issue on my DT 480 of sliders not staying in place which is basically twice the weight of the DT 150. They weigh around 500g whereas the DT 150 weighs 250g.One thing I dislike about the DT150 is that the headband is really narrow and thus really bad about making hotspots on the top of my head and getting very uncomfortable pretty quickly and needing almost constant readjustment. But the other day I realized that the $25 price tag on Dekoni nuggets is for a pack of four, not just two like the Amazon product page lead me to believe. $25 for two nuggets seemed insane so I never considered them before, but $25 for four is much more reasonable, so I picked up a pack for my DT150. And I can confirm, the nuggets completely transform the comfort of this headphone. Can wear this headphone without issue for hours and hours now.
Added bonus, I assume it's just an issue with my particular DT150, but the cups are very loose on the yokes and always slide down to full extension. That used to be too much extension and they wouldn't sit right on my ears. Previously I had gaffer tape wrapped around the bottom inch or so of each yoke so the cups could only slide down to the beginning of the tape rather than the end of the yoke. It was a fine solution for me, but adding the Dekoni nuggets to the headband added an inch or so to where it sits, which means now with the tape removed again and the cups at full extension, it fits perfectly.
So yeah, the Dekoni nugs are a huge comfort upgrade for this headphone. If you have comfort issues like I did, I very much recommend them.