Getting the TV's

So in the study break, I finally retrieved the TVs I needed for my project. I have actually retrieved three of them.
We have a National AC/DC Battery. and two NEC portable colour TV's, one from the 80's and one from the 90's

Now with these TV's I need to work on a way to make them transmute digital input. Because all of these TV's are Analog.

National AC/DC Battery

90's LG Colour TV

80's NEC Colour TV

The Two Tutorial videos that have been the most helpful:

LGR. (2016, May 27). LGR - HDMI on a Black & White TV [Video File]. Retrieved from: https://www.youtube.com/watch?v=fMiMz1uGCXI&t=246s

Videos XP. (2016, August 6). How to use an old TV as a second Moniter [Video File]. Retrieved from: https://www.youtube.com/watch?v=wFVibCic1jY&t=158s

Ideally I would need these items for this to work smoothly. (images in order of the list)

Coaxial Cord

Double ended RCA cable

Coaxial to RCA Converter (RF Modulator)

HDMI to AVI Converter

https://www.techexpress.co.nz/products/2-meter-male-pal-rf-to-rf-cable

https://www.lifewire.com/rca-cable-definition-1082146

https://www.amazon.com/RCA-Compact-RF-Modulator-CRF907R/dp/B0014KKV7W

https://shop.skynetitalia.net/en/accessories-cctv/hdmi-video-converter-to-av-hdmi-2-avi

However the converters may be hard to locate and find for affordable prices. So I may need to get a VHS machine to act as a converter.  The VHS Machine must have inputs like this..

(Videos XP, 2016)

I have also been talking with other people to see if they have any of these things. Otherwise i might just have to us ea normal TV. which would be a shame. I reckon adding an old TV would really improve the project.