Do these work close enough to V-Color for Vinyl?

You will need a really good protective coating once you're done painting. Shapeshifta used Tamiya and might still use it. I've used it to test out on a piece. Needless to say I'm not too happy with the way it turned out but then again, it could be due to my lack of skill. The biggest difference between the 2:
Tamiya paint will rub off a bit too easy if you're pretty rough when handling your figure. If you take your figure apart to paint, there's a good chance you might scratch the paint off when you put it back together. Tamiya will also take longer to dry.
V-color, from what I've read, bonds with vinyl on a chemical level. It will still scratch off but it is a lot more permanent than Tamiya. It will also dry much faster than Tamiya.
Be warned, chemical reaction = not very good for your health so you should look out for number 1. My friend said "There is one thing in life that you will always own til the day you die, and that's your body."
There are others here with a whole hell of a lot more experience than myself, but I thought I'd just throw in what I've learned....and as they say...GET PAINTING!!

Tamiya paint is what I used for the custom show pieces I did. Like gatcha said it does chip off way easier than v-color. I had troubles putting it back together. I touched it up after putting it all together.
It also has a matt finish. I sprayed Mr.Super Clear by Mr.Hobby at the end to give it a gloss finish.
If it's for just display I think it's cool but once it falls to a hard floor it may do some scratch damage.

don't fuck around. if you're gonna paint vinyl, you gotta go V-Color...

Tamiya should be left to its Master ...ShApEShiFtA!!!

My LilJapan Evil Rules though !

I use Tamiya and Mr Hobby when I do garage kits(as well as Vallejo). I have done all my custom toys with Tamiya or Mr Hobby and there have been some minor issues, all I was able to work around probably because I have been doing garage kits for over a decade. Although I have not used V-color yet, I would recommend it just from the results I see here, its made for vinyl as Tamiya and Mr Hobby are for garage kits vinyl, plastic or resin.