I've got a few 3D planes with considerably more performance than the stock Yak and I'd not describe any of them as 'monsters' in any way at all. Nor are they particularly fast (despite having over 1kw under the hood in some cases). 3D models aren't about top speed.. 'Twitchy'; well maybe, but only if you have very high rates set. Put in low sports rates and they are really very easy to fly.
I've never quite understood why people seem to spread the rumour that high performance 3D models are inherently hard to fly. Possibly people like to make out they are some kind of vicious monster that can only be tamed by the most expert of flyer to make themselves look good? IMHO nothing could be further from the truth, sure they aren't trainers but they are a lot easier to fly than some semi scale sports models I've owned in the past.
Admittedly I cant speak first hand about the Yak specifically and I know for a 3D model of that size it is a bit heavy side, so probably doesn't slow up as well as my balsa 3D models, but I'd be surprised and disappointed if it was that tricky. If it really is that bad then it must be a total dog and would best be avoided at all costs, there are plenty of sweet flying 3D models out there.
Though I do agree that such models are a bit of a stretch as a second model, but not impossible considering the OP has had some sim time and flies helicopters etc. Compared to a helicopter ANY fixed wing plane is a trainer.