Not really sure what to think about this one. On the one hand it does seem like a sensible implementation (unlike Russia's), but is it worth it?
The amount of additional recruits seems to be very limited (2 now, up to 50 under review as of now) and comes with additional work. Can't really see those numbers change anything in a meaningful way.
And on the other hand you give critics an easy target to attack. Now they get any easy way to downplay Russia's use of prisoners ("see they are doing it too"), make Ukraine seem desperate ("they are running out of recruits and are scraping the barrel"), or any number of false stories.
In an ideal world that wouldn't have an effect, but sadly it does.