I believe so. It gets mentioned over on the eSIM thread from time to time.
I'm going to go the opposite for my next trip. I feel esim is still too hit and miss with providers. Have converted my local Optus to esim and will keep the physical SIM slot free for the local SIM I'll buy on arrival or online
www.australianfrequentflyer.com.au
The setup might vary for different phone types. On iPhone, I believe the secret is turning on “Wifi assist” and Telstra as the default line for calls/SMS and amaysim for Data.
Hopefully one of the boffins here can confirm if there are any other tricks or traps.