If it is one of the old ones with the pads, a conductive pen would work fine, wouldn't even really need to be a fine tipped one. Just make sure to let it set for at least 7 minutes after application. To remove it you just scrape it off or use a qtip with some solvent like alcohol. Only reason I can see to do it would be because the chinese updates are a tad more difficult to track down, and may be on servers that are really slow to your location.