Is there any way of "engaving" sequential numbers into the flat cavity of a 350 cavity mould tool?

The cavities are laid out in a diamond pattern, which doesn't help the situation. It doesn't even seem possible to copy and paste "sketch text".

It looks like I will have to engrave each cavity individually!  This is a long slow process and will also slow the model down substantially as well I assume.

Thank you for anyones thoughts on this problem.

David