That’s actually not what I was suggesting, but instead to disable the powerup timer which usually holds MCLR,
and use the MCLR pin yourself that will lower the power up time to what is acceptable with a stock reset circuit
consisting of a resistor and capacitor. But if you can use a cap on the supply, the thing I’m working on now
continues to multiplex a display for a couple of seconds after power off with two 470uF caps.