You can download AAO’s demo from there: https://axisandohs.weebly.com/
It has (IIRC) 30 minute limitation and then it automatically shuts down, but you can see for yourself what functionality it has. Search AS1000 for G1000 commands (they will be under HTML variables). Can’t recall if it has G3000 commands there by default and I’m not at computer where I have it installed, but you can check yourself. 530/430 are there. GTN750 isn’t, but PMS gives the variables to use in it’s manual, so you don’t need to go looking them yourself and can make simple scripts to use them.
Spad.next also has demo, in this case it’s something like 20-30 days of unlimited use.