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It is a very fine powder almost like powdered sugar if I recall correctly. So it flows pretty good, and with a little funnel, you should be able to do that fairly quickly.
Some tire shops like Les Schwabb on the west side of the country have a device where they can feed it in through the valve stem. But if they are in the process of mounting a tire anyway, they will sometimes just open the bag and pour the contents into the tire before mounting it to the rim...
I used to have some of those 37 inch hummer tires on my lifted Suburban. Tire places would put a whole bunch of lead weights on them trying to balance them and it wouldn't work. I believe a lot of them are out of round. They used to break the shock mounts off my steer axle when I'd hit that...