Garen W and Dominion

So, the current PBE rework has Garen's W grant up to 30 armor and MR, 0.3 per kill (including minion kills). This means that in order to get 30 stacks he needs to kill 100 times. I checked some of my old Garen Dominion games, and I seem to average around 15-30 minions per game, not counting champion kills. The W changes is going to hurt top lane Garen. What should be done about it?

1: Don't launch the farming-mechanics of his W. Even for Summoner's Rift farming stacks tend to be boring and tends to lead to some snowballing. A Garen that is prevented from farming is going to fall behind, while a Garen who gets a few kills in lane might be able to farm really well and snowball even harder. It also tends to create a player mentality of "I need to farm stacks", see Nasus.

2: Give Garen some map-specific buffs, stacks per second might be a good idea. Maybe give him 0.25 stacks per 10 seconds or so, and remove the farming interaction to prevent bot lane Garen from snowballing. That would give him 15 armor and MR 10 minutes in, and he'd hit max stats at 20 minutes in. That seems somewhat reasonable to me, but if it's too strong Riot could tone it down a bit, to perhaps 0.20 stacks per 10 seconds (0.1 stacks per 5 seconds). Another alternative is giving him stacks per level, which would grant a similar result but would be less reliable and we'd see more snowballing Garens and more Garens falling behind.

3: Increase the amount of stacks he gets per minion. I don't think this is going to work well, since in order to really benefit from the small amount of farm top lane Garen gets, you'd have to give him 4x or 5x stacks, and then he might be tempted to farm hard, thus forcing Riot to reduce the amount of stacks to something like 2x. It would also make bot lane Garen much stronger. Giving him stacks per second is safer.

4: Leave Garen as is, which might leave him weaker than the current Garen on Dominion.

What do you guys think? Is there some viable option that I didn't bring up?