I doubt increasing albedo would help much. Venus already has the highest albedo of any planet in our solar system (at 0.75, versus, for perspective, our moon's 0.12), due to its effectively-100% sulfuric acid cloud cover:

https://sciencing.com/albedo-planets-5203.html

https://www.universetoday.com/36833/albedo-of-venus/

Also, I doubt an insignificant chunk of ice (relatively speaking) could help cool it, or increase albedo.

I think the first order of business on Venus, if one wanted to colonize the surface (rather than colonize the atmosphere, which I think is doable), would be to "harvest" the gases of the atmosphere and thin it out to something more resembling Earth's.