Yes, but more adhoc like "starting now I will dedicate 60 minutes to X". Any solution that requires me to schedule ahead or needs me to add my todos in yet another system is too much work. Especially when todos are written with pen&paper.

Your solution (https://www.cloqworq.com/) which accesses Google Calender and moves todos into slots looks cool.

I somewhat look forward to a hardware solution that includes blocking access to internet or other distractions like https://www.indiegogo.com/projects/saent-be-less-distracted. I've tried kitchen clocks (countdown) but they just added stress and pressure and didn't do anything to keep me focused.