I would place the AHDSR to the master gain of the event rather than the transceiver’s level, otherwise stop may not left the event to fade out.
The fade out time should be matched closer to the length of the reverb tail, unless the transition between the spaces needs to be sharper so the tail should be fade-cut out shorter.
These don’t need to be Transceivers, they can just be normal Sends to the mixer return that contains the Transceiver.
However, if you use Transceivers in every event that needs to send to reverb, they won’t in fact have to route through the mixer at all - they can just send directly to the “reverb channel”. The signals will mix together (I’ve tested sending multiple signals to the same channel, they just mix).
This way there will actually be less latency, than with going through the mixer.