Make existing Option in use still extendable by defining additional redactions so subscribed systems can continue using existing credentials

We have the following EEM situation that seems not yet been addressed in a solid manner by EPM. We use redaction to strip away some confidential attributes from the single source event (complex object). When we publish the option and e.g. 20 systems already subscribed, we might get new attributes in the backend system publishing the source event that find its way into the event. We do not want to produce 2 different event objects per backend change on non-schema breaking changes. However, when the new attribute is also confidential (only few systems may see it and another Option is available for that) it should be removed by redaction as well. This, however, means that we need to change the options, which is not possible today as long as it is published and subscribers are registered. So we have to define a new option with an additional redaction. For our clients this means they need to subscribe for the new option (with the additional redaction) and replace the credentials in their code/config to still receive the same data as before. We also would need to monitor the existing subscriptions to make sure that no system still uses the old option and receives confidential data. We need to be able to extend the redactions of an existing published option (or some alternative approach to avoid having to unsubscribe all existing clients).