and, hours later
DKIM_CANON = relaxed
DKIM_DOMAIN = ${sender_address_domain}
DKIM_F = ${lookup {DKIM_DOMAIN.private} dsearch,ret=full {CONFDIR/dkim}}
DKIM_PRIVATE_KEY = ${if exists{DKIM_F}{DKIM_F}{0}}
DKIM_SELECTOR = rgnet-mail
works
yoiks
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