If the problem is lifting the lathe onto the stand, and you cannot arrange an overhead lift (Engine crane, pulley block +skyhook, or shearlegs) how about jack and pack?
It will be slow, and you need to take care that both ends rise at very nearly the same rate, to prevent it sliding off, especially onto you!
If you have helpers, who can steady the lathe, it may be possible to get it onto a stout board and lift that with a car scissor jack, (they are usually rated for enough weight to cope with your lathe)
Jacking and packing may be tedious, but it will lift it high enough, if you can obtain enough packing. Am loath to suggest bricks or breeze blocks in case they should crumble (the risk is with old ones, new may well be OK for the short times that they will be subject to the load. This is where your helpers come into play. They steady things so that if there is any risk of slipping they ) steady things, and b) warn you so that you can back off.
Once level with the stand / bench you slide the lathe off the board into place..
Once on the bench / stand, mount one of my hobbyhorses and take any twist out of the bed.
then you are all set for ages of enjoyment.
Howard