Hops are in 205L plastic drums cut in half or fabricated colour bond pots lined with plastic sheet, vege patch is old bathtubs, waist height so no bending/kneeling required.
OK, so wicking beds are really just big self watering pots, and are usually half filled with gravel or scoria which is then covered with geo-tech fabric before adding the soil, you need quite a bit of depth to get any reasonable amount of water storage, it's also fairly expensive, and a massive pain to clean out when the time comes to move or maintain.
My solution is to use ag pipe
https://www.bunnings.com.au/reln-stretch-ag-pipe-100mm-x-8m-slotted-and-socked_p4770281 coil it up, and cover with geo-tech, use the 50mm for smaller containers, very little space is taken up by the pipe compared to gravel/scoria, so the water reservoir using 4" pipe is probably equivalent to a couple of feet or more of gravel, plus when the time comes it's just a matter of removing the dirt, lifting out the geo-tech, and you're done, no barrow loads of gravel to contend with.
Push the geo-tech down between the ag pipe for better wicking (although to be honest I haven't noticed any difference)
Very important is drainage, if it pisses down you can easily end up with plants in a pool, and like us they will eventually drown.
I have a 1/2" hole drilled into the side of the containers level with the top of the ag pipe, and a short length of black plastic irrigation pipe going through that hole into an open end of the ag pipe (sorry if that's confusing, it's easier to draw than explain, bugger it, see terrible pdf drawing) it's then covered with the geo-tech.
Herbs is an old drinking trough from a primary school, a few bits of pipe and some 50mm ag pipe, set up just outside the kitchen for commonly used stuff like parsley, thyme, tarragon etc I've included it to show just how little depth you need when using pipe instead of gravel, height of summer no rain, and full of plants it gets watered (via the fill tube left hand side of Herbs 1) once a week.
IBC's are about 900mm high, the same as my 205L, which are chopped in half and have a single layer of 100mm ag pipe, if I was doing it with IBC's I'd be inclined to just chop the top off and use a double layer of 100mm ag pipe, this would give you 600mm-700mm of soil depth, and a heap of water reservoir, four rhizomes per container would be about right imho.
This isn't the only solution obviously just my way of doing it, but I hope it gives you something to think about.
Cheers G