You change the political system for voting for a party/parties that commits to radical systemic change through prioritising the bringing forward of a Bill to the Oireachteas enacting that radical change.
You make sure there is a viable party that will commit to such change by putting pressure on whichever party which has, to date, demonstrated a willingness to consider radical change. My money is on FG in this context, although the proposals they have outlined in their 'New Republic' policy document don't go nearly far enough. I intend e-mailing all Fine Gael TDs with ideas on how this document could be made more radical.
Labour have set out some ideas but, imo, they merely tinker round the edges of the current system. The rotten bargain at the heart of the client state remains intact.
Fintan O'Toole will be putting up on his website a list of 10 commitments he believes a new government should make to radically change the political system - they will provide an interesting starting point.
At the end of the day, it is up to citizens to make clear to political parties exactly what it is that they are demanding. That HAS to include a willingness to give up the fringe benefits that people receive (or think they recieve) from the clientilist system in exchange for a genuinely transparent and honest system, where legislators are able to take decisions that may be locally unpopular in order to institute a coherent and equitable national framework.
FG also have some good ideas on public service reform (which, as it happens, would not necessarily be beneficial to me personally as a civil servant but which I think could result in a genuinely transformed public service which would be fit for purpose)