Options for replacing mortise lock with keyless lock
There are certainly mortise-form-factor smart locks; I installed one of them last year. They tend to be commercial-grade rather than home-grade; more durable and able to handle more complex programming but also more expensive.

At one point several manufacturers were offering smart mortise cylinders, which did a digital handshake with a powered key to make the key extremely difficult to duplicate. Thay would install into your current latch mechanism. But I presume that isn't what you:re looking for.

If you were a paying customer I'd ask you to be more specific about what you need and then do a search thru the manufacturers. A full-time locksmith would be more aware if current product lines and would find the answer faster.