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@frankenbike
Liner only adds a degree or two of warmth.
I'd get a new sleeping bag. If you want to get a bit crazy you could get another one the same and sleep in both at the same time which will (theoretically) provide double the insulation. My friend slept in two fairly cheap winter bags and was as toasty warm as me in my ~1.5kg Rab down bag that was quite expensive
But you know, try it in the garden or something before you go off into the wilderness with only two thin summer bags