If the scheme is 35% underfunded then the proposal seems to be trying to share the pain between both current members and retired members. From your post I assume that current pensioners are being paid out of the fund rather than the scheme having offloaded the liability by buying annuities.
If the Trustees were to close the scheme and now buy conventional annuities in respect of retired members then this would deplete the scheme assets further, since conventional annuities are largely priced off German bunds ( thus more costly).
So I am assuming that what is being proposed it that annuities will be bought for retired members ( offloading the liability) but that such will be a combination of conventional annuity and sovereign annuity (an annuity based on say Irish Government Bond rates). This combination will be less costly but does transfer an element of risk to retired members in that their sovereign annuity element could be reduced in the future if the Irish Government defaulted at some time in the future ( as often suggested by Sinn Fein, United(sic) Left Alliance and the other crazies).
The equity here is that all members take some pain, since current members will also suffer a loss of pension value. If retired members were to be provided with conventional (more expensive) annuities, then the underfunding would be much worse for current members.
Unfortunately, due to increased longevity, lower bond yields and regulations forcing Trustees to invest pension funds more conservatively, this is an issue facing most DB schemes (Aer Lingus, Independent News & Media, Bank of Ireland etc). This is not an issue facing civil and public servants (including those who make the rules that are so impacting private sector schemes) since their pensions are unfunded and simply paid out of Government revenue.
I hope this helps.