On controlling project cost, a wise, old Project Manager once told me, "there's a time in a project where you have to shoot the Engineers, and begin construction".
shvet and Ed align with my thinking. Option B mixes better. What is the cost of failure? Is a coating really needed, or will SS be okay? IIRC, standard MOC in static mixers is SS.
Is there a basic problem? High dP, need more flow, need more heat transfer, burnt product at the wall, or, as stated, you are just coming up to speed on your process? Those articles are great. I got copies (poor ones) long ago from my megaCorp's library. I recommend calling ChE magazine and...
Even when properly applied, it seems the terrorists may just need two vehicles. One to displace the barrier, and one to do the deed. That means the lone wolf may need a partner, which probably decreases the odds a plan comes to fruition, which is good, but it's not total prevention.
Who cares, right? Once you get your system built with the transducers in place, get the system data and develop your flow correlation. Then, the details and intricacies of your system are baked into the data and your flow correlation.