Even though you can't initiate a remote renewal of the device's IP, it should phone home to the DHCP server if and when its network connection is disconnected for awhile and then reconnected, at which time it would pick up the new lease.
Normally when you disconnect/reconnect a network cable the client will phone back to DHCP since it no longer knows which LAN it is attached to. On WiFi devices, brief disconnection is by design not sufficient to trigger a refresh, but a longer outage should still prompt the client to request DHCP. I would guess that the if the client device is taken home for the evening and then returns in the morning (or even a lunch break, etc) it should pick up the new lease settings.
You could also attempt to force this by briefly disabling the SSID to which the client is currently connected (a couple minutes may do it).