You may need to be aware of the one problem that real time 'vox' switching has.
That is the loss of the initial part of the first letter of the first word, every time the switch is activated.
It may not be a significant factor in your application, but for some it's unacceptable.
You can design the 'trigger' circuit to be pretty fast, but you will always lose something. Some word 'first' letters are worse than others.
Probably the most famous example of 'vox' switching loss is Neil Armstrong's first words on the Moon:-
"That's one small step for man, one ' -iant' leap for mankind".
Most of the 'g' of the word 'giant' is missing (G seems to be a particularly difficult letter to deal with, in vox switching).
As I say, may not be a problem, but if it is critical , you can save a lot of effort, by looking to use a manual 'press to talk' switch instead.......