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You could get the stained glass panels encapsulated into tripple glazed units, which looks good... although you'd have plywood fitted for a few days whilst they were made up.
As @Airhead said, your frame can probably take a DGU if your frame is thick enough for thinner beading/DGU/ moulding (or replacement beading). The edge sealing and spacer rods normaly intrude 11mm from the edge of the glass, but this could be more around the curved edges of the upper panels, so ask whats possible.
Although I'm interested why he suggested 6mm glass for a fairly small window, when 4mm is more common and would allow an extra 4mm of air gap. Likewise laminated for a fixed window with no obvious risk of you falling through it (low level or bottom of staircase), unless its just for increased security.
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user69121
Airhead
We have this window in our house which I think is original to its build. I quite like the stained glass and want to keep as is, however the whole thing is single pane and the beading for the bottom pane is rotten on the outside beyond repair. So I'll need to replace that but am contemplating whether it would be worth swapping the glass for a double glazed unit. Can anyone suggest if it would be at all meaningful in terms of heat retention? Or is it forever doomed because of the stained glass upper section?
Also how DIY able is it? Would the top half fall off if I remove the lower section? I suspect I'd need to make a new frame for the inside too to account for the extra thickness of the double glazed pane.