uniswtc, I don't know which version introduced the Maintenance Mode feature, which includes scheduling options, but I'm running NPM 12.5 and it's possible to unmanage devices from there.
Instead of using NPM to manage our 3000+ AP's, I use Cisco Wireless Controllers (WLC's) and Prime. NPM knows the status of our WLAN by monitoring the WLC's.
Upgrade to the current version of NPM; you might be surprised to find it performs faster (due to the new requirement of using SQL 2016 or greater), and that it has new features and fixes for problems in 12.2. Then give the Maintenance Mode feature a try.
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