Capture with (moving) attachment?

[Tim Landscheidt <tim@tim-landscheidt.de>]

Hi,

I have a capture template to file items to a list:

| ("i" "inventory" entry
|  (file "~/Desktop/Agenda/Inventar.org")
|  "* %^{Name}" :immediate-finish t)

Currently, when I want to file an item with an associated
image, I open the directory of the images with dired, visit
the image file, use the capture to add an item, kill the im-
age buffer, use M-0 w in dired to copy the file's name,
switch to the org file, use C-c C-a m to attach the image by
moving the file, and then switch back to the dired buffer.
Lather, rinse, repeat, until the directory with the images
is empty.

What I want to do instead is open the image file (via dir-
ed), have the capture do the attaching by itself (if it is
called in an image-mode buffer) and then kill the image
buffer.  (Emacs does not care if the file associated with
the buffer is deleted in the mean time.)

First idea was to use %(EXP) to set
org-capture-after-finalize-hook to attach the file, but that
hook is called in the original (image) buffer.
org-capture-before-finalize-hook on the other hand is called
in a CAPTURE-Inventar.org buffer (with no associated file),
same with org-capture-prepare-finalize-hook.  (I also would
like to perform the attaching only *after* the item has suc-
cessfully been filed to avoid misfiling/deleting image
files.)

There are other ways to achieve this in this particular case
(capture, visit the org file, go to (point-max),
(org-attach-attach file nil 'mv), maybe even replace capture
with an (insert (format "* %s\n" (read-string)))), but are
there general solutions for this issue that will work, well,
more generally?

TIA,
Tim