Got interested myself, as I have seen si8b tubes reduced in size/weight this way I found one defective SBT10A and cut with a metal hand saw around the perimeter.
Apparently it is possible, but cutting should be very careful. You should avoid pressing the tube because if geometry of the perimeter is changed, the mica window could pop-open and kill the tube.
This is even more possible as the pressure of gasses inside the "bulb" is lower than the one outside.
Also it is important not to penetrate through the perimeter inside in order not to damage the glass appendix of the "bulb" or the wires which come out straight of glass or are point-welded to the exterior of the "bulb" (cathode)
So when you have it cut around the perimeter - first thing is to desolder the cathode wire from the pin 11 (cathode wire is simply soldered inside the pin 11)
Then desolder all other wires from their pins going from topmost (pins 1 and 10) to the bottom-most -pin 6.
However all goos is while it is good - so all risks are to yourself - please note, I have been disassembling the already broken tube ...
If instead you decide not to risk - you might be interested then in this socket for SBT10 here
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