When you mention alternative, are you looking to handle this from directly within your HubSpot Portal or are you looking to see if there is a possibility of increasing the limit?
My understanding of the link you posted is that there is a hard limit of 750 event types per app, rather than a limit on the number of events themselves (each of which would be of a certain event type).
Do you know if the hard limit of 750 pertains to the creation of event types only or also to the creation of individual events? If so, is there any hard limit on the number of events (as opposed to event types) that can be created by an app?