Good question jdsf. You anticipate well - I had considered the same 'problem', and came up with the following solution.
I could dig very deep holes - except that all these cuttings are destined for other homes - friends, family, a couple of UK forum members, even strangers. I don't have room for more of the same, so they are all going to be given away. I'm just sorry I can't ship any to my US buddies, etc., for obvious reasons.
But obviously I can't give them away in this state, so the plan is:
1. Separate them very carefully, firstly by removing those 'neck' extenders, then the bucket.
2. As you say, they will then be too tall to go in any pot that I have, so depending on length they will be cut in 2 or more pieces.
3. The 44", for example, will give me 4 rooted cuttings, but only 1 with any top growth. The other 3 will be, in effect, root balls that will be completely buried in PM.
4. So the only remaining question is how those other 3 will fare? My guess is that they will push through in bush style..............or die.
5. When I know the answer, I'll update.
6. But yeah, I take your point. In the end, I've still ended up with small cuttings. On the plus side tho, I've still got a guaranteed rooted cutting, and potentially more of them if the others push through as well.
Thanks for your interest.