Test rides do seem to be the preferred option. But since you don’t want to do that anyway, let me present a counter argument.
What will you really gain from a test ride? You can change the feel of a bike quite a bit with simple changes (bars, stem, etc) and lets face it all the bikes you mention are decent bikes. Unless you can really take them away, change all the contact points to suit you and ride them around lots of routes that you know really well, you’ll probably just be choosing an expensive bike based on the way it’s set up.
I reckon that there is a lot to be said for just buying a bike that speaks to you in some way, that you like the look of or from a company you like and just riding the crap out of it. Get to know its strengths and weaknesses and how to get the best out of it.
So, get the Rocket.
Cheers
Andy