SCART Switches with "Record" Features

[Omnigamer]

Hello all!

I'm trying to uncover some mysteries behind the "recording" functionality present in some RGB SCART switches. Devices that advertise this feature include the Automatic version of the 5-port Bandridge switch (SVB7735) and the Hama AV Selector 100S. I'm using these switches to swap between various retro consoles over RGB, however when trying to make use of the "Record" port I only get part of the signal. Specifically, only sync and red end up in both the picture and according to some basic multimeter testing. At first I just thought my initial unit (the Bandridge) was just busted, but to my surprise the same thing also happens with the Hama.

So that leads me to believe that something is missing from my setup. I realize that neither is set up as a full-on matrix device, but I find it hard to believe that both devices would advertise such a feature but then not implement it fully. Some possibilities:

-Duplicating the RGB signals may depend on voltage coming from pins 8 and 16. None of my console connectors put anything over these pins, so any boosting based on these signals will not occur. The Bandridge is powered, though, so I'd expect it to use that to power any functionality.
-Both devices may be limited in duplicating RGB and instead only provide Luma and Chroma duplication over the record port. On this point I've tried to trace out the leads for G and B, but there doesn't seem to be anything that is distinct from R and S. I could just be bad at it though. I can give more details on this aspect if needed.
-Both the main output port and the Record part may have to be used simultaneously to operate as expected. I'm not entirely sure why this would help or if it matters, but it's the last example case I can think of that I'm not currently set up to check.

So that's where my questions come in. First off, has anybody successfully used the Record function of a similar device for RGB? If so, did you have to do anything special? If not, is there any interest in investigating modifications to these switches so that they can fully support RGB signal duplication?

I know that what I'm really looking for here is a cheap distribution amplifier for SCART. I know dedicated devices for this purpose exist, but as a US resident none of these devices are easy to find or reasonably priced. Ideally I'd just be able to use these Record features since I only need one duplicated signal, but I'd definitely be wary of degradation either way.

Any past experiences or insight is appreciated!

[blizzz]

Unless it specifically states that the record feature supports RGB you should assume that it's just composite.

[Omnigamer]

If that is the case, then the other part of my question stands: how much effort does it take to make it complete? I know this varies by device, but the two I named are fairly popular units; I imagine I'm not the only one with an interest in such a solution for them. If the record feature is truly only meant to copy the signals from pins 20 and 15, that's already half of what we need. In the case of the Bandridge we also have a power supply to tap into if needed.