2 Cam splitter for a Rear only Cam?

Does this exist, or not worth attempting?

A Cam 'input-splitter' to use a 'Rear only Cam' of an aftermarket HU [Alp, Sony, Kw, Pionr] as a 2nd Cam.
IE: Operator can manually Toggle to one Cam or the other, as needed.

Still shopping for HU upgrade and some of my options only run a Sgl, Rr Cam.

2nd option: possible to install a 2nd Cam, via HU HDMI input?

 

Please clarify what you are trying to do. Your question is a little confusing.

 

Buy the head unit that will accommodate a front & rear cam. When you use the maestro module to install the head unit you can program the maestro to toggle a switch on the steering wheel to switch to different cameras.

 

@Tundra234 ...

Can a Single Cam HU utilize a 'Splitter' for camera input [?
said 'Splitter' would allow for connection of 2nd Cam on a Sgl Cam HU; is such [hack] even possible... is what Im asking.

@lerbud1 ...
Dont have SWC.
Agreed on a HU w/2 Cam inputs, but have a brand/model that checks all boxes, Except its only a Sgl Cam...altho does have HDMI input.
Would HDMI input allow a 2nd Cam input ?

 

Not sure about the hdmi. Something like this would work:

 

thx @lerbud1 ...I think that might be otherwise known as a 'Video Switcher' ?
Also, presuming the device works, if I wanted a Frt view Cam, I would need to disrupt the reverse trigger circuit somehow in order to see the image while in drive, or anytime I wanted.
I think most mobile cams dont have direct HDMI output; might need a type of 'gender-bender' terminal to carry signal, IDK yet.

 

So, all of my above query was based on 2 BIG 'boxes checked' by the contemplated replacement HU: Sony xav-AX8100 [9" display].

1. 9" display: being larger than 7's and also closer to reach & operate while driving
2. No SWC in my sr5, so this is the only HU i know of whose IR Remote operates, not only VOL, Mute, but also Display OFF, Source, Mode, BT, USB file selection and EQ selection.

Addl 2 Boxes checked:
3. 20 watt RMS [CTA2006]: might not need an ExtAmp [not into loud, just clean SQ] ?
4. HDMI input [2nd cam possible] ?

BUT [and this is a rather big one],....a big minus:
Resistive display. Most common complaint of this model = 'Not bright enough in daylight ops'.

IDK; Im likely back to the drawing board...