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For the most part it doesn't matter what composite source you use. There are two exceptions IMO.
Most VHS VCRs lack an internal TBC so when playing back tape you can get flag waving bends at the top of the picture and other distortions... There's also macrovision (which is present on most commercially released tape and disc media) which violates legal NTSC composite video values and plays havoc with most vintage TVs and other equipment used to view it. (There are macrovision remover boxes out there that are about the size of a deck of cards.)
The other source I would consider avoiding is the cheap plastic cased Chinese HDMI to AV converters and the similar HDMI to RF converters on Amazon, eBay and the like. They often have no color and video performance issues.
Most VCRs would be pain to fit in a briefcase and have room for a decent external modulator and or power source.
What I would probably use if I wanted a media player in the modulator case is a Sony SMP-N200 network media player. They take 12V DC power, have composite output, can play photos audio and video files off of a large USB drive and also off of a network through WiFi. They're about 6" x 6" x 2" so you could probably squeeze it in somewhere easier than most other sources... Except maybe a raspberry pi which I think are smaller.
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