Depending how much you're over the 35 character limit, you could save yourself 4 characters by dropping off the 'www.' at the beginning, which is allowed in Adwords at least.
Other than that, I'm not sure what you can do beyond buying a new domain.
im tempte dto buy a shorter domain and copy teh content over, woudl this harm my seo for the original domain tho?
hc
I would definitely not recommend simply copying the content wholesale on to a new domain - you may well find one (or both) sites being penalised for having duplicate content.
A better approach would be to set up a new domain specifically for your PPC campaign I would guess, although you could be looking at a lot of work (depending on how much content you'll be wanting to add)
I wouldn't see a problem with sticking to the same layout - I often use a standard template across a number of sites and have never seen any evidence of being penalised.
So yes, I would think that the same layout with original content should work fine