using leafnode with existing spool

I read my various mailing list subscriptions by feeding them into what
may be the world's last surviving cnews system.

I should like to have nntp access to this. Unfortunately, I never
saved a copy of nntpd, and I can't find the source anywhere.
I want minimal effort, so switching to INN is more work than I want.

Can I use leafnode to provide nntp access to a spool managed by
another system? (If leafnode can do the indexing, that's good, but I
don't want it thinking it can either inject or expire articles.)

thanks,
JCB