Hello,
Yes, we can fix your staging and then update production next week, no problem. Once everything is fixed on the staging site then we’ll be able to move all the changes to production during the next 2 hours I think, so the timeframe of your client is ok. Our time zone is GMT+1. Our support team members are from different countries.
Just let us know when you are finished checking everything. If you find something just make a list of things that we need to improve on the staging site. Then we’ll be able to proceed.
Regards