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Preface; The psychic actions secondaries all need help and a rewrite, but:
So, I've been thinking. A unit of 3 weirdvane psychers costs 24 points. A unit of 4, 32.
A unit of 4 has a 66% chance to complete mental interrogation. (1d6+1)
Is it worth buying 3 units, either deep striking them or hiding them in a chimera, and using them on consecutive turns to get this action completed?

Upside:
less than 100 points for 9 VP (and possibly 15 if they aren't wiped upon appearance...)
The strat that gives +2 to cast powers and cast two powers if you have a unit of weird-vanes and a primaris near each other is really useful (and lets weirdvanes make the psychic test 84.3% of the time.

Downside:
Making the rolls is a chancy thing, but 66% is good.
You still need to do it 5 times to max the secondary (which is a joke compared to others)
Weird-vane Psychers are uber fragile, have very little combat value, no character protection, but can smite and can use another power if they live long enough.
3 units of weirdvane psychers give my opponent 9 VP if they take Abhor the witch.
Plus 1CP for deep striking possibly, or a chimera which has some use otherwise.

Not sure the drawbacks outweigh the plusses, but trying to find different options. Thoughts?

So basically remember your system requires a psyekr primaris around to be near enough the wyrdvanes to doublestrat .. which means you are now up to 4 units of psykers (1 a character that can also be assassinated) and three of them without any protection at all.
If, that is, you go for the very likely casting model. Which also, as most break the action economy strats, costs you in cp to do.

I am not saying its a bad idea. I fairly frequently run a little strikepack of psykers with a primaris (the named one) and a wyrdvane group in it, as part of a valkyrie loaded beta strike wave.

For a lot of armies though, sticking that relatively small group out at the bleeding edge of a gaurd parking lot might deeply endanger the psykers and wyrdos, and give the enemy 14 points back for the 9 to 12 you take.

Would you not be better with 3 astropaths

Only Characters can attempt Mental Interrogation. This is a non-starter.

Which means astropaths

Or a psyker primaris using the 3 wyrdvanes to get a +2 on his or her cast of the mental interrogation. That strategem could be useful to insure the good rolling. So its not a complete non starter -- just I don't think its something I would go for. (However, being able to whip out your smite or malstrom while also interrogating is kind of nice, and all at +2.)

I haven't run the wyrdvane + primaris combo, but I have used a 3 primaris as a smite battery in 8th.

Mortal wounds are increasingly valuable in the meta of elite infantry. Holding the middle of the board is often the deciding feature of games in 9th and getting your pyskers around the middle means targets often both high value and easy to move into being closest.

The +2 gets you a super smite on a 9 roll....

It doesn't give you +2 to psychic action only psychic powers

Lot of good points here!

My guard army moves forward, so getting a primaris in range of an enemy character with units around them isn't an issue (I do also use a chimera often as a sort of HQ transport)

I had missed the only a character part of the action (yet another aspect of how poorly done the psychic actions are...)
An Astropath might be the better way to go, and they get character protection. Boy they really made the wyrdvane's a joke.

Still have issues with the points gained vs given up.

Thanks for some thoughts and discussion.

I note a commwnt in here.. That only psyker powers are aided by the strat ... Its not so. The strat actuallly targets the psyker test result... Which gains a plus 2. In performing a psychic action you must pass a psychic test just the same as if you were using a pasyker power. Its clear yhis allows you to amp up the roll of the psyker or psy unit doing the test.

Using the disposable wyrdvanes to augment a psyker primaris is a valid way totry to get better odds of a good roll .. And you canaccomplish that if tou must by rolling 3 sets of 3 whrds in from strategic reserves. They might die.. But you get at least 3 psyker powersand actions a round at plus 2.