Don't go for no more nails imo - it is very strong and if you want to remove the skirting later it could be a pain.
I would use gripfill white (non solvent) in the yellow tube - it's not as strong as the standard green (and much easier to work with) and that is what you want. non solvent gripfill produces a good hold but the skirting can be removed with a short sharp whack with a tack hammer as the glue itself is very brittle. Skirting that is relatively warp-free will not pose much of a task for gripfill.
There's such a thing as warp-free skirting? (the answer is yes, don't buy from b&q lol).
Cheers Superficial, i doubt i will want to remove it at any point, or so far in the future i wont care but just in case, i think i'll go for gripfill.