I’ve considered that in the past but never did it. If the floor is basically solid and sturdy with just pinholes I think that might be a decent option.
Think about sucking it up and buying a welding setup. Prob about $700 for a decent MIG setup with 75-25 Ar CO2 shielding gas. Welding with MIG is not that hard. It may not look pretty but it won’t be visible for floor repairs