Regardless of whether simultaneous output is required or not, a scart switcher is meant for putting multiple inputs into a single output, whereas the original poster wants one input going to multiple outputs, i.e the sort of product I linked to.
A lot of cheap scart switchers only work in one direction.
Quoting the JS Technology website:
"The Active Video Buffer V2 is the solution to connecting two video units from one source. Each video output is a perfect copy of the input. Since all video lines in the SCART connection are buffered, the unit can be used with RGB, S-Video and Composite SCART sources. The Active Video Buffer can be used with other J.S. Technology products as well as other manufacturers.
Superior to SCART splitters which merely share the signal between your destinations and subsequently reduce the picture brightness and quality. The Active Video Buffer V2 regenerates the input video, restoring correct levels for distribution to your two displays. This maintains the brightness of the picture, but also helps to isolate both displays. The load on one will not affect the other.
Widescreen switching is important, and so is function switching to assert that RGB is enabled. The Active Video Buffer V2 supports both, each output has it's own independent output.
Applications for the Active Video Buffer V2 are endless. As an example, if you have a projector and TV, use the Active Video Buffer to keep both connected and reduce those hook-up nightmares! Where you require two video outputs and wish to maintain picture quality, the Active Video Buffer V2 is the solution.
For flexibility with your cabling requirements, the Active Video Buffer V2 has three SCART sockets. One SCART socket is provided for the input with two SCART sockets for the outputs. This allows for the use of our high quality SCART leads or the flexibility to choose leads that meet your individual requirements.
Measuring just 120x98x45 mm with an external power supply, the Active Video Buffer V2 is compact and easy to use.
Utilising the same high-quality multi-layer fibreglass PCB construction as other J.S. Technology products, and with components from some of the world's leading manufacturers, this level of quality and detail is not often found at any level. Designed and manufactured by J.S. Technology in the UK."