Lifetime of (SysEx)Event

[Boscop]

I was writing a VST for a HW synth to convert CCs to SysEx automation and vice-versa (while letting irrelevant msgs through unchanged). Due to the lifetime on Event/SysExEvent.payload I couldn't just map incoming msgs to outgoing msgs, but had to push those msgs that should be mapped to SysEx to a separate vec, and then send that one afterwards (so I have two calls to send_buffer.send_events, one for the filtered input events and one for the payloads vec mapped to SysExEvents). But I want to preserve the ordering between the input and output msgs, i.e. not change the order of the param automation. So this requires being able to return SysExEvents where the payload's lifetime comes from a vec outside of the mapping closure. But currently it's not possible, I get:

error: cannot infer an appropriate lifetime for lifetime parameter in function call due to conflicting requirements note: ...so that closure can access payloads note: first, the lifetime cannot outlive the lifetime '_ as defined on the body at 336:44... note: but, the lifetime must be valid for the method call at 336:17... note: ...so that a type/lifetime parameter is in scope

The lifetime that the incoming events have comes from this: https://github.com/RustAudio/vst-rs/blob/d7d5b6f0c049bac923c87ab9d49ca743a8adcb6a/src/api.rs#L454-L457

Any thoughts what the best approach would be, to make this kind of use case more convenient?