Bare rooting would be too much of a shock to the tree, especially if it takes a couple of days. It’s having the soil and roots together that aids the recovery and encourages fine roots to grow. Simply putting some soil in with the roots probably wouldn’t work as efficiently. You haven’t mentioned what species of tree you are planning to lift.
It is fine to bare root deciduous, indeed it should be done prior to potting on, but with conifers you definitely need to keep as much of the root ball in tact as possible.
If the tree is quite local to you it is possible to undercut the root ball in September and lift it the following spring. Far safer as more capillary roots will have grown thus creating a cohesive root ball for you to lift.
If this is not possible then when lifting a yamadori, start from about a metre from the tree and work in a circle carefully cutting the roots. Once you have ascertained how the roots look you may be able to move carefully closer to the tree and cut a bit more off. Then dig at least half a metre underneath before tilting the tree to see the roots growing underneath. What I would do then is wrap the root ball in burlap (Sack cloth) and either plant in your garden for twelve months or do as the video on yamadori repotting states. There really isn’t any shortcut for this.
Have you watched the video where Ryan interviews Randy Knight? He is a highly successful yamadori collector in the US.
Hope this helps.
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