The core of RSV was Explosive Shot with Lock and Load. Not the current Explosive Shot, the old version.
Once again, a comparison:
Old Explosive Shot vs. New Explosive Shot:
Core spender vs. talented nuke
Single target vs. AoE
Short CD vs. long CD.
Instant damage, intense micro-DoT vs. delayed singular blast.
Benefits from Lock and Load vs not.
Make a new ability, call it Incendiary Shot, replaces Aimed Shot, behaves exactly like old Explosive Shot. That would be the minimum requirement to replicate the old RSV rotation.