Reddit mentions of SunplusTrade 100pcs 11.8 Inches Stainless Steel Exhaust Wrap Multi-Purpose Locking Cable Metal Zip Ties

I think the cheapest possible somewhat viable solution is steel zip ties.

They sell steel zip ties that have a tensile strength of close to 200lbs. Just wrap those around the frame where the bolts were, they should hold you just fine. I used to make signs, and we used zip ties similar to these to hold signs in windy places, and they are seriously strong.

https://www.amazon.com/SunplusTrade-Stainless-Exhaust-Multi-Purpose-Locking/dp/B072WC1MXT/ref=sr_1_3?keywords=steel+zip+ties&qid=1569682553&s=gateway&sr=8-3

I can't believe it took me so long to learn about stainless zip ties. I bought them for doing a turbo blanket wrap on my MINI Cooper, and ended up finding a lot of uses for them. Thinks like exhaust support on beaters when the hangers rust out, rattling heat shields on cats, etc etc. Something like this

Yeah, I see. That does sound to be an issue where the force of the snow is stronger than the pieces holding it together.

The plastic buttons will only work if they actually fit in the holes though. My old splash shield was actually held on by metal screws. Which did the job until they just corroded and rusted to the point where they would fall off.

The zip ties always worked for me but I also didn't have to drive through deep snow with the car. If anything, it was mostly just slush.

They do have stainless steel zip ties. Maybe they would be strong enough to hold it in place?

https://www.amazon.com/SunplusTrade-Stainless-Exhaust-Multi-Purpose-Locking/dp/B072WC1MXT/ref=pd_sbs_263_t_0/136-5397765-0847362?_encoding=UTF8&pd_rd_i=B072WC1MXT&pd_rd_r=fdc24f29-0782-4b9c-8b96-6f9031e56660&pd_rd_w=a5n13&pd_rd_wg=Za0YO&pf_rd_p=5cfcfe89-300f-47d2-b1ad-a4e27203a02a&pf_rd_r=3VYS6GE0YT7HE0E9XAT4&psc=1&refRID=3VYS6GE0YT7HE0E9XAT4

Hose clamps are best but baring that they also sell Metal Zip ties that also work in a pinch. I always stock some, never needed them on my stuff but I've given away a fair few.

I'm surprised a standard 1/2 band width doesn't fit. You'll probably have to go down one size to a 5/16" band width. http://m.hoseclampkings.com/cat-122-1-89/410-ss-screw.htm has a bunch but their MOQ is 100 units. Search on Google for a 5/16" band width hose clamp. They are typically in shorter lengths due to their smaller width but I'm sure somebody makes them in longer lengths.

You could also try stainless steel zip ties: https://www.amazon.com/SunplusTrade-Stainless-Exhaust-Multi-Purpose-Locking/dp/B072WC1MXT/ref=mp_s_a_1_3?keywords=steel+zip+ties&qid=1558490451&s=gateway&sprefix=steel+zi&sr=8-3

They make stainless steel wire ties

SunplusTrade 100pcs 11.8 Inches Stainless Steel Exhaust Wrap Multi-Purpose Locking Cable Metal Zip Ties

https://www.amazon.com/dp/B072WC1MXT/ref=cm_sw_r_cp_apa_16BQBb75ZYW80

In case they have knives! Hopefully they won't have wire cutters or something.

There are stainless steel zip ties. Would these work for you?

SunplusTrade 100pcs 11.8 Inches Stainless Steel Exhaust Wrap Multi-Purpose Locking Cable Metal Zip Ties

SunplusTrade 100pcs 11.8 Inches Stainless Steel Exhaust Wrap Multi-Purpose Locking Cable Metal Zip Ties https://www.amazon.com/dp/B072WC1MXT/ref=cm_sw_r_cp_api_M9I5Bb7KS6JAF

Zip tie a shopping cart to each handle