This is very similar to processes I've bootstrapped. I do prefer ongoing tech debt paydown as part of deliverables rather than Fixit Sprints. Either way, invest in long-term productivity.
Strongest agree:
"Separately, it’s worth highlighting again that a big part of this process is making sure that the people who are doing the work understand why they’re doing it so that they can make small judgment calls on their own and know when to come back and ask for guidance.”
https://third-bit.com/2024/03/08/our-process