Waste of time/effort, the Ukrainians already have the Su-25 which is essentially a better A-10 so it would be better to instead convince other ex-SSRs to send theirs. But the problem is that Ukraine can't use their Su-25 effectively anyway as they lack the air superiority to deploy them properly.
The A-10 is a plane that's spent the last 40+ years living off a manufactured hype, it was sold to politicians and the military with the idea that if WW3 kicked off it would lay waste to the masses of Soviet tanks streaming into western Europe and that's what many still envisage despite it never living up to the hype. I.E in Desert Storm it's now estimated that as much as half the targets originally claimed to have been destroyed by the A-10s (excluding friendly fire incidents) were actually destroyed by the superior F-111 (US equivalent to the Su-24 or Tornado).
The A-10 is a cool plane and will always have a special place in the heart for those who grew up with the hype, but in reality it's only useful when you have air supremacy and the enemy has no anti-air. And in those situations there are other planes you can send that will do the job better.