Dunno, package description of 'Desktop Switcher' states:

"Desktop home plugin to switch between active destops/views." (sic)

I did it in an unclean, but my way:

1) exported settings:
gconftool-2 -R /apps/osso/hildon-desktop/applets > gconf-desktop-settings.sh
2) altered file so that it contained only the applets that were on desktops 1 and 4
3) exchanged "4" with "1" in 4 steps
3) altered file so that the format per line is correct:
gconftool-2 -s "/apps/osso/hildon-desktop/applets/TaskShortcut:albion.desktop/view" -t int "1"
executed the 'gconf-desktop-settings.sh' script, followed by 'killall hildon-desktop'.

Ok it was quite some effort, but at least it was quicker than manually moving the shortcuts. I'm pretty sure that with some meta-scripting / wildcards, you would be able to alter the settings under /applets/*/view with a simple command line.