No, it will be fine. The water will overflow in the filter, if the filter has a failure. Using a Durso in the bean should not be a problem, only maybe a little harder to tune. But looking at yours you are going to have two siphons very close to each other, they may fight each other and have a hard time starting.Thanks for the info, the silicone tubing was a concern of mine, I'll shorten it.
Regarding the secondary going into the roller mat along with the primary, wouldn't that defeat the point of the Bean Animal's redundancy and create a single point of failure?
Also for the durso standpipe in the overflow I understand you're saying it's not needed but is there any disadvantage to using one?