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I’m pretty sure the filters you’re talking about are exactly what the converter I’m talking about does, if we’re not talking about the same thing (unless you’re talking about software filters)
I use a project called MiSTer for most of my retro needs these days, but there are definitely a bunch of other upscalers and things that can create similar effects.
Generally I find the quality of CRT emulation effects is much better, more accurate and more subtle than they used to be.
Some people swear by real CRTs of course, but getting a good picture out of a good CRT is usually an expensive (or at least time sinking) endeavor. It usually involves RGB modding consoles, or at least getting something like S-Video out. Many of us grew up with composite video, but it’s pretty gnarly when you go back to it.