maybe,yes. I'm not sure they'd cover the access hole to the threads though...
look on www.mcmaster.com for way more options, sealing washers, etc. but yes you can do that.Are the threads long enough and the right size for a 2020 250?
If you use an eye nut and some threaded rod (or cut the thread off a bolt) then will be possible to control the orientation of the eye and mount of compression of the washer... with some trial and error "fiddling about".sealing washers
Threaded rod rusts badly but I guess you can paint it.
You can buy stainless steel all-thread. Not really that hard to come by.Threaded rod rusts badly but I guess you can paint it.