I like the Midas preamps of the Behringer even somewhat better than the UR816’s.
What do you mean by less monitoring control? You have 2 headphones outputs on the UR816C with 4 different mixes to make in software available.
Using even the line outputs (on the URC as well on the Behringer) for a further monitoramp like f.e. Behringer HA series, you would have even 4 different phone-mixes send to more than 4 phones or speakers. Would that not be enough for your goal?
When you buy two URC’s you cannot use them as 2 interfaces together, Cubase will only allow 1 interface at a time.
So you would just use the second URC as an “extension”, an expensive one.