Is it suitable to use a hair rig when fishing waggler and corn or meat on a commercial fishery ?

Absolutely. You can get scaled down versions of the hair rig from Korum products. There are little plastic spikes that can be used to attach soft baits, there's also a spring There is the bait arrow, the bait spike and the paste spring which are ideal for using soft pastes, boilies or cat food. Alternatively you could use the small elastic bands for attaching pellets, etc, which will leave the hook point free.

you could do it but the chances are you'll miss more bites than you catch as the hook wont enter the mouth as much as it should. As it's not a self hooking rig you'd have to allow more time between pick up and striking.