Instead of the CD4511, have you considered multiplexing ? It should work 
very well for incandescent displays because of their inherent storage time 
and you wont have any visible flicker. And best of all, no ghosting !!

You can also add PWM to keep the dark segments warm, which should help 
extend their lifetime.

My father used to design aircraft instruments, and it was common practice 
(until LEDs came along) for incandescent bulbs in lighted switches to be 
kept always-on, either bright or dim. Those bulbs were rated for 100,000 
hours of operation. You'd be amazed how much heat was generated in the 
cockpit of a 747.

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