I think the big issue on using reverse after landing with a massive fuel leak from the engine cowl would be that the fuel will be picked up and carried forward and then ingested into the engine inlet. This would cause the engine to "run away" and not respond to the throttle. Would have thought that shutting it down in flight would be preferable. Spar valve would cut off fuel flow and stop leak. But then, I'm only a maintenance person.
Re hot stream reversers. Both the B-747-100 with JT9D and the L-1011 with RB0211-22B initially had hot stream reversers also called hot stream spoilers. Both had them deactivated after service experience. Trying to keep push-pull cables running along a hot tailpipe on the B747 or high-speed flex cables and rotary jackscrews also adjacent to hot parts on the L-1011 proved to be bad ideas. They were a continual problem and maintenance breathed a sigh of relief when they were removed.