If only descending 1000', most of us would probably try to do this in a gentle manner. You could push for managed descent; if you haven't yet reached TOD the autopilot will only demand a 1000fpm ROD. Personally, I'd probably do it in V/S between 500-1000fpm ROD up at that level. The aircraft will have entered the descent phase so if you want to revert to the cruise phase, you can simply enter the new level into the MCDU, however, at only 40 miles from TOD, it wouldn't really make much difference. Different airline's SOPs might dictate a certain way of doing it, but mine doesn't - just a bit of airmanship
Doing the above in OP DES would be a bit enthusiastic I might suggest, as it will command the autothrust to flight idle, only to be brought back up again seconds later after a short 'plummet'!