Epic filter on strategic roadmap

Strategic roadmaps are incredibly useful, thanks to the ability to drag epics/features, adjust timelines, and display dependencies. However, they lack a fundamental feature: the ability to filter by epics/features, which are a main recordtype displayed in that roadmap.

Here's why this is important: we have plenty of epics in the backlog which we want to "position" in time for internal purposes (e.g. resource planning). However, I don't necessarily want to show these to external stakeholders. One easy way to do that would be to have these features be in a "under consideration" status, which then gets filtered out for external-facing roadmaps. However, this is not possible in the strategic roadmap, which forces me to use a custom roadmap for this purpose.