It can be done easily with the right equipment - namely, a champagne corker like this one:
[url]http://www.northernbrewer.com/shop/champagne-floor-corker.html[url/]
I have one but my LHBS rents theirs out for $10 a day.
Also, those bottles will take the Euro 29mm bottle caps but you need the larger bell for yor bottle capper, about $10.