lock the 10 outputs of 4017 to HIGH
There is an IC that can lend itself to this problem. Use a CPLD part or an FPGA to implement the logic of the five Johnson counters (4017's). Then change the logic to either add in a layer of OR functions at each counter output or change the fundamental design of each of the Johnson counters such that there is an "force all outputs high" mode.

If you look at the equivalent circuit of typical 4017 such as this one from an old Intersil / Renesas data sheet:



You will be able to get a good idea of the logic function to implement in the CPLD/FPGA. You will also notice that the "force all outputs high" (AOH) mode can be implemented simply as: