Thanks MandaC
OP, if the company is formed, then that's it done. If the shareholder doesn't pay the required amount on the share, I'm sure there are all sorts of procedures that you can follow to not register the issue of the share (see your Arts for that process). In that case the share will never have been fully paid up. Then you'd (according to your Articles) issue a new share to the willing second shareholder, file a B5 with the CRO. What I don't know (and MandaC probably will) is whether you can even get to this second step when one of the subscribers has not paid up on the share.
It's the two original shareholders that are definitely mentioned as subscribers, yes? Often, with company formation companies, there will be two completely different names as subscribers (on companies that are ready to go) and you'll just transfer those shares to the people who want to "set up" the company. If this is the case, it may be an easier process insofar as you can just transfer that second share to the person willing to be a shareholder.
Not sure why the original shareholder would have a problem with the original solution proposed - is the share price very high? Are they not contactable? I wanted to give you the simplest solution to your query and, to my mind, trying to find out how to change the original subscribers is not the simplest way by a long margin.
Sprite