[Poohbah]

Maybe the second stage deployed with a smaller, more compact launch vehicle?

How do you get it going fast enough without the booster?

You'd still need an rather large vessel to carry the launcher, target acquisition radars, and guidance radars, along with their power supplies.

[archy]

Maybe the second stage deployed with a smaller, more compact launch vehicle?

How do you get it going fast enough without the booster?

I'm thinking somewhat less of a booster than standard. I'm no aerospace engineer, but I guess if Saddam's old Scuds could be hotrodded, so could a more modern solid-fuel unit.

You'd still need an rather large vessel to carry the launcher, target acquisition radars, and guidance radars, along with their power supplies.

It'd need to be both a large enough vehicle to low-profile and yet carry a 7 meter/21 foot-long missile in its shipping container and with enough deck spece to erect and fire it; not impossible given a 30-footer or so, but a bit more than could be managed from a ski boat or Boston Whaler. A smallish houseboat might be a possibility, though.

And it might be possible to eliminate much of the supporting electronics if the guidance system were reworked to home in on an airliner's transponder instead.