Ukraine atm has millions if not tens of millions of mines all over the place. Adding a few hundred or thousand bomblets wouldnt make things measurably worse.
Many of these wont even be used as artillery shells, they will just strip them and ducktape the bomblets on fov drones.
Both sides have been extensively using mines and cluster munitions, because they are extremely effective. Sending Ukraine extra ammunition will save countless ukranian lives.
After the war, both sides will have a strong incentive to remove mines. Mines are often an issue for poorer countries, who dont have the funds to clear them out. Of course even in Ukraine there will be incidents decades later, but they should be comparatively low(to the amount of mines used).
Ultimately, the issue with cluster munitions is mostly about conflicts that dont already have millions of mines, because failed bomblets can act like mines. Thats less of an issue in Ukraine, because it already has millions of mines, acting like mines.
PS Russian cluster munition are terribly unreliable, much more than even old nato ones