Applying policy via script with duration period

Good Day,

Currently we have blocked all USB via device control policy and we have roaming users which most of the time are in business travel for a long time. My concern is in case we receive a request from them to temporarily remove the device blocking how can i do that? i'm aware that i can send imported policy which has no device blocking and import manually on SEP client. how can i do it temporarily as i want the blocking policy to be in placed again. is there any script that can define certain duration to apply back the device blocking policy? 

looking for possible solution. Thanks

Regards,