I've tried to find an answer on the forum but I couldn't... hopefully I am not blind

We have a call center which uses OTRS and one of the queues gets hammered.
Right now when we receive a request from say customer@domain.com and we don't know how to answer we forward the email ouside of OTRS to say expert@domain.com. We wait for a reply for 48h and if we don't receive an answer out agents will sent a reminder to them manually.
Is there away to automate this? So we'd like to send an automated message to expert@domain.com after 48h and again after 96h if they are still not replying.
I would like to mention that expert@domain.com cannot be added as a client because we have hundreds of experts and they always change.
I hope I've been clear...
Thnak you so much for your help!
Best Regards,
Andrei