>>There is a way around the problem with the chain link fence. Insert plastic strips through the links. I do this to a height just above the tortoises shell. If they can't see through in their everyday wanderings they seem to look at this as a solid barrier. I also use 1 inch 'tennis court' fencing which I think is stronger.
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We had rebar buried in the ground which worked but even so our old chainlink fence was here when we moved in & wasn't in great shape to begin with. We have no idea how old the fence was but the sulcata adoption gave us a good excuse to just get rid of it then replace it with something better.
We do however have chainlink in the new gates but it's a thicker chainlink than normal residential chainlink, it's made to keep hogs penned in. Hopefully we won't have a problem with that when the tortoise is even larger than she is now, but because sulcatas push & push & push where hogs probably don't we still might have to use the plastic strips you've mentioned.
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PHRatz