Build as functionality for Node-RED.
This may require routing some processes through NRPC or gRPC to avoid errors if agents are hidden from web.
Some more flexible approach may be required for more flexible threading and success / failure routing.
Add functionality to migrate existing LEI environments to Node-RED.
This may require some hard decisions about pricing, but LEI is basically in maintenance mode, with no new functionality as far as I know. For example, I don't think it's possible to schedule a job to call a REST service and set up OAuth. Whether the migration tool and/or Node-RED nodes are licensed, or whether it is covered by a separate support agreement, there are options for replacing the current revenue. But by migrating to a more modern open-source platform, it may reduce current support costs of keeping it running on the latest Domino versions as well as finding a way to allow customers to migrate their LEI environments as part of a move to DAC or other cloud alternatives.