image startup: package

Hi,
this is a follow-up to a question that was asked recently - I'd like to
start an image and
invoke a function residing in a package other than CL-user. The "naive idea"
alisp -I myimage -e '(in-package mypack)' -e '(myfuninmypack)'
won't work as has been discussed earlier. With the posted solution
(extension to clinit.cl),
however, I can only invoke the package upon image start, but not call a
function -
it would still be looked for in cl-user.
Can it be done?
thx, Manfred