otlp MetricExporter in a custom event loop

[CrimsonAndRed]

Hello, folks! I am trying to use an OTEL exporter in a form:

let exporter = opentelemetry_otlp::MetricExporter::builder() ... .build().unwrap();
let provider = opentelemetry_sdk::metrics::SdkMeterProvider::builder().with_periodic_exporter(exporter).build();

which does a background work of metrics exporting and is working fine. Though I would like to move periodic jobs on my own event loop. Is it possible via current API? Looks like there are just 2 options available for MeterProviders - either use with_periodic_exporter(..) or with_reader(..). I assumed the latter one is an option for me, but can not "connect" reader to exporter.

Of course I can set gigantic duration for exporter, use with_periodic_exporter(..) and do provider.force_flush(), though I expect... more elegant solution.
Thanks!