It’s a good idea, and nicely laid out as always.
However, if you want it to work correctly in eurorack then you’ll need the clock and data lines fed from a transistor as a switch, and the outputs connected to transistor buffers, especially if driving leds from the output as well.
The 4015 is particular about its inputs - it needs signals close to the power rails, and doesn’t have that much driving current on the outputs.
