Calb, I think you already found the thread I posted (a long time ago now) with the same question. The combination didn't make sense to me at the time, but it does now. There was another INTJ woman on the forum back then that I talked with about it a little. She and I seemed to have a very similar method of interpreting the world around us.
Don't try to FIT yourself into a combination that you think makes sense. We are what we are, and the more self exploration you do, the more comfortable you will be with yourself. Remember that the whole point of the Enneagram is to "learn" to use the best parts (and understand the bad parts) of all the types. The order you encounter them in depends on which direction you are "moving". All that being said, I am in a good place in my mind and in my life, so I guess I am a pretty "healthy" (and emotionally aware) INTJ 4w5. The director in my IT department recently told me that I have a unique combination of technical and soft skills that makes people want to follow my lead. I thought it was interesting (and rewarding) considering how often I used to piss people off or put my foot in my mouth. Anyway, here is what I have discovered about the extreme ends of my personality...
Unhealthy traits, when I was at my worst:
Controlling
Selfish
Angry but unwilling to admit it
Depressive/obsessive
Wrote lots of dark poetry with exaggerated emotional intensity
Felt extremely alone
Cajoled (and disrespected) anyone who liked anything pop culture people, music, etc
Was unable to focus on big picture choices... And consequently made a series of "reactive" (and feeling based) decisions back to back, each one compounding the anxiety that I felt making my situation and outlook worse each time.
Engaged in highly sensate activities like drinking, over eating, etc
Repeatedly asked "The Universe" when it would finally be my time to be happy, like there was some kind of cosmic scorekeeper who ought to know that I had paid my dues and deserved better.
Used my skills in debate to crush people who disagreed with me, like they shouldn't be so stupid as to argue with me because I was ALWAYS right.
Shut out everyone who was close to me
Current Traits:
Have learned patience
Value other opinions as a learning opportunity
Use pop culture references to build connections with others (May be a bit calculated, since I don't always love or even like the things being discussed, but I willingly partake and refrain from tearing things I don't like apart, verbally. In my head I still might.)
Practice small talk, but still find it nearly excruciating. I have mastered the appearance of taking interest in people's lives, even when I could care less about what they are making for dinner or how funny their cat is. I found that sometimes I learn neat things that ultimately do build a genuine bond with a person... It just takes weeding through the fluff to find it. It's a bit like tending a garden until a flower blooms lol.
I have much less of an ego than I used to have.
Emotional highs and lows are less frequent, and I can recognize (and redirect them) when I get moody.
I am aware of how others are feeling in a way that I never was before. Still terribly awkward at offering comfort, but I notice and do small things to make their life easier.
I consciously try to motivate others and help them reach their goals.
I still dislike physical contact with anyone who isn't my husband. (Who just happens to be the ENTJ mentioned in some of my last posts here a few years ago!)
I have moved more to the wing 5 of my Enneagram type, behaving like the Achiever more frequently.
Not sure if any of this really helps you, but know that the combination is not only possible, but if used to improve yourself, it can be very rewarding.