re: Crematorium Management System, it might be possible to do that rather easily with a CRM? I develop mostly with CiviCRM (https://civicrm.org). It is contact-centric (rather than sales-centric), with good workflows for communications. You can add custom fields or custom activity types to track specific types of data or activities.

However, my experience in those kind of niches, is that the client will likely be very non-technical, and will prefer to use what everyone else is using, even if it's vastly overpriced and locks their processes in place.