I don't think a surge protector would work. A surge protector is designed to fail in a certain manner when it encounters a massive power surge. What we a talking about, while more than the affected equipment can handle, is just a spike that is riding on top of the incoming AC power. The surge protector wouldn't even notice it, we need to filter out that spike.
In my 30 years of industrial controls design I've encountered this problem a few times. There are small DIN rail mounted filters that are used to protect equipment that is sensitive to this sort of thing, they might work. Here in the states both the Isolatrol and Sola brands come to mind, and I've used them both. (Google AC power filters)
For a "temporary", and portable, solution you could mount the filter and a receptacle in a small box. Wire the input of the filter to a plug and the output from the filter to the receptacle. You might even be able to find a filter that has already done this for you. If the spike is big enough though the filter might not work.
Another trick that I have used when I'm desperate and can't think of anything else, or nothing else works, is to use a computer UPS - Un-interruptable Power Supply. The UPS will effectively disconnect the incoming mains power from the outgoing mains power. Any electrical noise, your spike for instance, will not be transmitted through the UPS. This used to be an expensive option, but a UPS is "cheap as chips" anymore. Since you don't need to power your device for more than a few seconds at most, you wouldn't need more than the minimum UPS capacity.
Don