Mixing both nkeys static config and trusted operator setup (decentralized auth model) is possible but needs some preparation in order to be able to do it.
The way this can be done is by first preparing a basic trusted operator setup that could be used in the future, and then base from that configuration to create the NKEYS static config using the same shared public nkeys for the accounts and then use clustering routes to bridge the two different auth setups during the transition.
For example, creating the following initial setup using NSC:
