DND_Reborn
The High Aldwin
No. You can't do this IMO. Since using your action to verbally command your companion is not the "Attack" action (it would be the Use an Object action I suppose...), the Crossbow Expert never gets triggered (no pun intended).
Even if you have Extra Attack, and you command your companion to take the Attack action, you gain an extra attack (not Attack action). With the attack granted by this special instance of the Extra Attack feature, you can make any normal attack, including using a net. So, if you have Extra Attack and verbally command your companion to take the Attack action, you could use the net, but since you never took the Attack action yourself, no bonus action hand crossbow shot.
Even if you have Extra Attack, and you command your companion to take the Attack action, you gain an extra attack (not Attack action). With the attack granted by this special instance of the Extra Attack feature, you can make any normal attack, including using a net. So, if you have Extra Attack and verbally command your companion to take the Attack action, you could use the net, but since you never took the Attack action yourself, no bonus action hand crossbow shot.