The above would likely be acceptable, but I have a few comments (as a former TO myself):
1) Raptor Green with Deathwatch pauldrons and iconography should be no issue - I would allow this for sure. Just make sure not only paint but models/bits are distinctive between this detachment and your Raven Guard one.
2) BA SCD - Personally, I don't feel you need to bring in elements of Red/Gold and Blonde hair to justify this. I would however bring in some thematic element to justify their savagery in comparison to the chapter-at-large. I had considered a similar detachment to run alongside my Raven Guard, and for my "head cannon" I was considering running my BA SCD as Moruturi/Moritats and giving them an appropriate amount of corvia and other grim/death related icnongoraphy. The parellels between Death Company and Moritats are definitely present. Alternatively, you could review the various Blood Angel successors and use one of their paint schemes (I feel like the burgunday/black of Flesh Tearers would pair nicely alongside olive drab). Remember: The key is to have them be distinctive and visibly different (at a glance) from 3-4ft away.
3) You can definitely do this. As other's have mentioned, if you use Lias, you can't use the RG Warlord Trait/Relics. You can however paint in Raptors olive drab, use Shrike, RG Warlord Traits and Relics, if you DONT use Lias (this is under the rules as counts-as). There are lots of Salamander green Ultramarine armies out there.
The key is to just have each detachment visibly different, at a glance, from a tabletop distance. If the difference is to subtle, you will get flak/push-back from players, especially those you beat that are sore losers.