The 'Rubble Sack' option was given as an answer to this problem some years ago, I cannot remember if it was on this forum or another but due to what seemed good advice I carried a pair of rubble sacks around in the bottom of my rucksack for a number of years.
Then one day there came a need to use them, having been unwise and not had a practice run in private and solo, my first attempt was in company....not wise if you are concerned of preserving self image.
Firstly they are bulky once put over the boots, so the foot does not go where it normally goes, even in quite mild currents. My first attempt was on the River Vyrnwy, a ford crossing, that had quite a distance between banks and was rather stony. Once across is where I should have stayed, it would have been a perfect use of this simple accessory and the dangers of having them as a sole member of the party would not have been discovered.
On my return back to the other bank, I should have noticed that the stony bottom had started a tiny leak, but brimming with the exuberance of my successful crossing I gallantly gave way to the suggestion of the 'pack horse' option and 'Piggy backs' became the order of the day.
The deepest part of the crossing was just before making the far bank and it was at this point I realised that the weight of a person on your back does not counterbalance very well with extra weight sloshing about a bootfull of water on one foot, I rather unceremoniously pitched my burden onto the far bank, mud (not a total soaking) were the recriminations that rang in my ear for the rest of the day. Mitigation for my efforts were not high on the agenda and for the rest of the day one very soggy foot was my only consolation.