Box wrote up one quite some time ago. Give it a shot. http://forums.demigodthegame.com/360215
)
No Shield III == not very "supporty" :-/ You don't have to get it early but get it eventually. Plus it makes BSW uninterruptable.
DJ is awesome against minions, esp with Nature's Reckoning which actually works in conjunction with DJ.
Basically, my Anti-Minion Oak build roughly corresponds to this build except it gets Blood and not BSW. You could probably go BSW, I've never tried it. Irek likes it though and it works decently, so you could talk to him about it.
1. Pent I /Shield I (not going to start a holy war here. I prefer Pent over Shield level 1 unless I'm laned with or against a Rook or if there is a Reg on the enemy team then get Shield. If you get BSW you will probably need Shield for sure).
2. Divine Justice I
3. Pent I / Shield I (get the other one)
4. Shield II
5. Surge I
6. DJ II
7. Shield III
8. Pent II
9. Pent III
10. Surge II
11. DJ III
12. Pent IV
13. Shield IV
14. SAVE
15. Surge III + Shield V (note that if you use Shield V on an ally you can BOTH be immune to interrupts and stuns)
16. Last Stand I (Suiciding on Citadel/Portal clusterfucks)
17. Last Stand II
18. Rally
19-20. Soul Power I + II (+40 Weapon Damage for 2 points. Pretty Meh but what else can you get?)
---
Typically if I have an Oak on my team I try to let him get the kill because of DJ. If an Oak doesn't have DJ and I let him get the kill, I swear violently at him. You have a weak Pent early game so you probably won't be getting last-blow so don't trip about it too much. Unless a more Pent-focused Assassin build you don't have nearly the same mana costs and can last up 'til level 12 with just NR + Unbreakables + Scaled Helm (instead of a typical BotF Assassin that basically needs Plenor + Vlemish to do anything at all, CoN builds typically don't have quite as bad of an issue but it's still rough). You also don't have to Surge creeps like a typical Assassin because NR typically does the job for you. Save your surges for killing minion swarms.
Unless they are a FULL morale+Ring of Divine Might build you'll heal roughly the same amount they damage you. Even full morale's have the "drawback" that by having more HP they are healing you more. Typically it works against your favor however.
Know that anti-minion isn't exactly what you were looking for but subsitute BSW for BotF and you're going to be pretty close to it.