Back in Stock flow - Can I send a second email only if the item is still in stock?

I'm running the standard Back in Stock flow (Shopify → Klaviyo, catalog synced). It currently sends one email when the item restocks.

I want to add a second email 24 hours later, but only if the product that triggered the flow is still in stock at that moment. If it sold out again during the delay, the profile should skip that email.

Is there a native way to do this, a conditional split or flow filter that checks live inventory for the triggering item? Or does this need a webhook / custom property workaround?

Has anyone built this? Curious what the cleanest approach is.