As for Academy players stepping up, you gotta think anyone close to 1st team ready would already be with the squad.
Kurtis Mogg's already had 3-4 seasons in the Reserves. Age 20. Feel if he's not good enough to be in the first team squad next season, likely never will be.
Unfortunately for him Surman, has come in take his chances and gone past him.
And yeah Covid has made it hard for NZ domestic (non Weenix) players to trial last few seasons. Auckland was in lock down from memory last year, when Nix were trying to do preseason in Welly with many players stuck in Aussie or overseas (Pennington in Italy). Only Oli Whyte trialled for the Nix (who they probably should have picked ahead of Prso), and so they bought in a heap of Weenix kids.
Hopefully Talay/Gill, look at some Kiwi domestic guys this coming pre season. Schnell, Kalua, and a backup keeper mentioned above are some options. Others no doubt.