I'm not sure where this will all end up; as I see it, there's more than the usual amount of room for confusion and debate.
UL is very strong in the electrical field; they're not quite as strong in the 'mechanical' trades. Therefore, there is a lot of perfectly fine equipment out there that has never been near a UL office. Indeed, for many items there is not even a UL standard. The end result is that we can't just hide behind the UL label.
So, let's look at the problem we're trying to address.
I don't think the issue is with short 'appliance whips' of CSST as much as it is with places where CSST is used as the primary material for gas lines. Yhis leaves us with two places where bonding MIGHT be required.
The first is at the gas main, with, perhaps, a jumper around the meter.
The second is at the appliance. If the appliance does not use electricity - neither my range nor my furnace does - then there is no requirement to bond the appliance. Yet, the furnace has a vent flue, suggesting a point for lightning to strike.
I'm not sure how much protection against lightning is provided by even a #10 wire from the appliance to the ground rod. It appears that lightning doesn't even follow the CSST, as much as 'jump' from rib-to-rib of the corrugations. This is how the pinholes are made. We might have a problem here that we cannot prevent.
It's possible that the best approach would be to have a permanantly installed pressure gauge at the meter, allowing you to pressure test the line at any time.