Convenience key for answering call

I've a friend who is blind, she's successfully using BlackBerry phones thanks to their keyboard, any now she's using a PRIV that is at its end of life (the power button doesn't work anymore and she needs a quick replacement because if for any reason the phone shuts down she might not be able to restart it).
With the PRIV you can answer calls just by sliding the keyboard out, a gesture you can't obviously do on a Key2.

Do you know if there's a way to easily answer with the convenience key or any other hardware input?
Thank you!

Double tap space bar answers phone. Works well for me.

Blackberry KEY² Silver Edition
Reg [emoji1063]

Perfect! Thank you!

Power key to end call as well. I use a bluetooth headset quite a bit and find many have a dedicated button for answering etc which is great. the Nenrent series work well.