Yes, but recall that TOS didn't have the f/x resources contemporary productions have. So they'd have to be really clever about how they did things with some measure of panache.
The two episodes I cited would've been relatively easily done. Fantastic Voyage had done with a traveling matte a year or two earlier, in fact. And the aging backwards wasn't even shown in VOY. The aliens just said, "Oh, we age backwards. That little girl you've befriended and been protecting is like 97 years old, Tuvok. Looks like you silly people from the other side of the galaxy age backwards..."
Things like the colony creature Bem or the Phylosians of "The Infinite Vulcan" and some of the other exotic aliens might have been beyond TOS' reach. The Gorn was as far as we saw them go. A non-humanoid alien would have to be very creative. The life-size Horta from "The Devil In The Dark" was as non-humanoid as we saw I think.
For the Phylosians, they could've whipped out the old "skunk cabbage" monster from Lost In Space and Voyage to the Bottle of the Sea.

Seriously, the nature of the Phylosians would've been easily eliminated. They didn't have to be plants; it wasn't even important to the story.
As far as Bem goes, he was a colony creature. He didn't have to disassemble except once or twice. Interestingly enough, Mark Lenard played a similar creature on Buck Rogers in the 23rd Century, and actually took his head off a couple of times.
DS9Sega, I hadn't heard that, but it would've be easily accomplished, I think.
Warped, can't believe you've forgotten one of my favorites: Yarnek. Plus there are a few others in "The Cage" that, like the Horta, were originally from "The Outer Limits."
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