Any way to black out screen during remote VNC connection to Mac?

Hi, I regularly connect remotely to Macs in my workplace, via VNC viewer from PC, in order to do support/maintenance work after office hours.
Unfortunately, the security guys in our office building often switch the target Mac/s off while I'm working on them, especially if they can see 'mysterious things' happening on the screen - could be an intruder, or a ghost! =8O
I can't blsme them, nor can I easily ask them not to do it - the place is huge, in a blue chip co, with many different security staff coming and going round the clock. Anyway, if I did ask them, I suspect I'd get an overzealous lecture about machines being left on overnight, blah blah.
So, can anyone tell me if it's somehow possible to black out the target Mac's physical screen while I'm connected remotely to it?
Maybe there's a VNC viewer app that allows this, or some Terminal command I could use?
I usually set up a scheduled power-on for the target Mac, then Shutdown when I'm finished working on it, so it's not as though it's being left unattended at any point, otherwise I could understand the security concerns.
I have to connect from a PC, else I'd be looking at using ARD instead. I can ARD to the Mac client from the Mac server, but that means a remote connection from within a remote connection - not recommended!
It would save me loads of hassle (and danger) if anyone could answer this one please?
Another thing that would help is if I can completely disable the target Mac's mouse & keyboard too?
Thanks for any help,
Paul.

Thanks for your suggestions Bob. I've now sent a feedback request to Apple, for what it might be worth. I'm not sure my user handle will endear me to them!
An excerpt from my message to them...
"Aside from connecting remotely, I've often heard people say they'd like to turn off a Mac's screen and input whilst leaving it running, for example during large overnight disk copies.
I can easily switch off a PC's screen separately (albeit not remotely), but still not able to do that on Macs, after all these years.
I'm sure such a feature would be welcomed by many, especially for privacy/security and energy conservation reasons."
Great if anyone else could also request the same, or, come up with a cunning way to do it?

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