Headset install: Fork crown race - damaged crown shoulder

I am not sure how to go about this headset install - see images below. The crown race shoulder is damaged. The quarter of the shoulder is still intact, but the rest is only partially there, and small section is missing completely. The crown race will be held on by mostly the little shoulder left at the bottom - not loose, but I am not sure how long it will last.

I am thinking epoxy for reinforcement. Alternatively, remove the damaged area and insert a shim? Please let me know if you have any other suggestions. Thanks!

The frame is Bridgestone Radac 2000, 1987.