changing usage flags on a primary key

[Daniel Kahn Gillmor]

Hi GnuPG Folks--

Let's say i have an OpenPGP primary key with usage flags ECSA set (some
keys like this have been known to be generated by GUI tools).

Say i wanted to convert this key into a decent primary key with a
reasonable/standard set of usage flags (e.g. CS or just C); is this
something i can do with GnuPG?

Basically, i'm asking about creating a new self-sig packet with a
modified key usage flags subpacket on a key that i control.  How would i
do that with GnuPG?

Thanks,

	--dkg

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