An adjustable splice?

[benz]

I have a long piece of Amsteel Blue that I must splice a length of with thimbles, but can't cut the rope down. Has anyone done a bury splice with a long tail just sticking out of the rope again after the appropriate buried length? The idea is to be able to have a temporary length of rope, with a thimble at each end, and then to be able to pull the splice out and make another length, and so on as the need requires. One end of course can have a regular lockstitched tapered splice, but the 'adjustable' end brings up some concerns. Will the rope weaken where the tail comes back out of the braid? Will the rope return to its shape once the splice is taken out?
This is not for a boat, so low-load loosening of the splice is not a concern--it will only be put under a high load.
Thanks in advance!
Ben Zartman