This is as out of the "Half-Humans" supplement? I wouldn't begin to guess what an ACKSy build would look like, but as a straight conversion:
Half-Orc looks pretty easy - it boils down to something like
- Darkvision 60' - can be had as Infravision, 60' for two powers
- +1 Save vs Poison & Death - that's a half a power
- +1 to reactions "with creatures of human size or smaller" - I don't know what that's supposed to be emulating, but it's probably half a power.
So, going by that, it's 3 powers. You could add the usual "4 extra languages" for another power.
At any rate, you could apply a racial value of "Half-Orc 0" to however you're handling classes for something like 75XP (3 powers) or 125 XP (4 powers), using the guidance from this thread:
http://www.autarch.co/forum/gnomish-infravision-0
...simply by adding that XP per level and knocking off the 14th level of any class.
Half-Ogre seems to be doable via something like:
- 1 Extra HD Value (500XP)
- Infravision 30' - 1 power
- Dungeon Bashing - 1 power
and that'd be something like 575 XP per level for "Half-Ogre 0". (625 with 4 languages) Half-Ogres read as not being officially "large" creatures, so that's probably enough...
Neither of these do anything about the +5% experience; I don't know BFRPG well enough to say how to convert that. I might add the dwarf's "+1 HP after 9th" to both of them, I don't think that has a notable XP value?
And I wouldn't have any idea on how to further either of those racial builds past 0 :)
Axioms #2 has examples of beastman racial classes done the ACKS way (I'm guessing that's why you've referred to the orc and bugbear options?), and may be interesting from a guidance perspective, but the racial values there are derived from the ACKS monster entry more than anything else - so they're complex and costly. It'd probably be enough to simply enforce the stat requirements rather than try and re-emulate certain things via the racial build.
For a straight simple conversion without a lot of hassle, the above is probably sufficient to achieve some semblence of balance.