Really depends. Some KHL teams believe in youth development, Others are just Trotz followers.
Now you want a league that is horrible for most young players....Liiga. Like I believe only 2 teams believe in youth development and opportunities. The majority barely give them ice time and while most still thrive even with the pressure most prospects often suffer and their stock gets impacted for the drafts.
As a Finn I can say that you're right and wrong there.
For young players - and I'm talking about 16 or under, the development program is pretty fine. Considering that Finland is a country of 5,5 million people, the fact that we have around 50 active NHL players and the amount of young Finnish prospects getting touted and drafted by NHL teams is constantly increasing I think we're doing pretty well in terms of developing young players.
The Finnish elite league, or Liiga as it's formally known, is the bigger problem here. Top prospects at the age of 17-20 can be playing in a top role in here provided they're good enough, but the level of the league itself is getting worse each year. The league currently has too many teams with only few of them having realistic chance of competing for anything meaningful, which leads to massive difference in level between teams. Five or six of the fifteen clubs involved try to get better, and the rest of the teams start selling their players somewhere else because it simply makes more sense from the financial standpoint.
For the prospect this poses a bit of a problem. You must be either a top notch asset to get the needed ice time in the better teams. If you're not quite at that level, then you must either settle for a smaller role in that better team and thusly lose some interest from the scouts, or find a weaker team where you might get the role you desire, with the cost of not playing in a team that is seriously competing for anything. You could say it's a double edged sword.
Finland's Liiga at it's current status is not a good place for a prospect unless you're an elite prospect like Anton Lundell for instance. Or Joakim Kemell this year for example.
Almost all teams in the league have a decent development program, but the development part of it "stops" to an extent once you go professional. The fact that most of the prospects come from team like Kärpät is mostly geographical - most of the young prospects at their early teens that come from northern part of the nation end up in Kärpät because it's the most northern city having a development program in the country for example.