try MTLarmory. They have buckles. Not specifically from the rucksack, but off of old 82 pattern webbing belts which should be the same size. Also quite cheap (before shipping ofc) in the off chance it doesnt work.
Assuming you have access to a gym, sleds would do it. Its not 100% the same as the sandbag drag but it does the same work as long as your pulling it backwards. Work at loading the sled up until its at the same weight as the sandbag drag (I forget what it is, sorry) but don't stop there. Go...
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