There are composite to HDMI convertors on Amazon and you get what you paid for.
I have one that I got for about $15. It might just be my 20/40 eyesight, but it seems fine to me. Of course, I can't tell a DVD from a blu-ray.
I've only used the composite-to-HDMI converter to connect my Xbox to my PC in order to record Xbox gameplay via OBS. I could, if I had to, get another one to keep permanently behind the TV if I can't get a TV with native composite ports, but having yet another device plugged in is a pain.
Connected to my TV via composite right now is my NES, SNES, Nintendo64, GameCube, Wii, Genesis, Xbox, Xbox 360, Playstation, and Playstation 2 - they all, of course, have a power cable. Eight of those consoles go into a composite switchbox that also requires a power cable. That switchbox goes into a second composite switchbox that requires power. The remaining two composite consoles (the Wii and the Xbox 360) go directly into that second composite switchbox. That switchbox goes into the composite ports on the TV.
I have my Wii U, Switch, Playstation 4, and blu-ray player going to an HDMI switchbox (that fortunately doesn't require power). Also going into that switchbox is a second HDMI switchbox that my NES Classic goes into. As soon as I open my SNES Classic, it will also go into that HDMI switchbox. The main HDMI switchbox, of course, goes into an HDMI port on the TV.
This leaves me with 14 game consoles, 1 blu-ray player, and 2 switches that require power. Along with the TV, of course. That's 18 power cords (and this is before I hook up the SNES Classic). I have two wall outlets behind the TV, each with two power outlets on them, for four things to plug in. So I have four power strips behind the TV. They're not all full, fortunately, but I do have to leave one open spot for plugging in one of my VR satellite cameras when I'm playing VR.
Not to mention the giant winding mess of composite and HDMI cords making a nest behind the TV.
And, eventually, I'd like to get a really nice sound system to go with the TV.
So avoiding adding a power-consuming composite-to-HDMI adapter is relatively important.
I'm not even sure what I'll do when I have a TV that goes on the wall instead of on a stand. Where do I put all the consoles? Are there just cables running up the wall to the TV?