You shouldn't even try. If a police force chooses to have a bean bag option, then a shotgun (perhaps in the trunk) would have to be dedicated for just that purpose.
As I mentioned earlier, I can envision situations where a bean bag shotgun would be quite useful. But no way should a single cop answer a knife call holding a bean bag shotgun.
Perhaps protocol in such a situation should be this: if multiple cops are on scene, one should be armed with a bean bag shotgun. That of course would not apply if the perp is suspected to have a firearm.
Beanbags.
Listen to yourself. Beanbags?
The guy is nuts/high, and is approaching cops with deadly intent.
What’s the beanbag supposed to do? Ya fire six of them, now he’s pissed off more than he was.