apologies for late response orz. yes, you can still trigger the renovation after achieving the good ending. i shouldve been more specific. i meant that you will have to complete the FOLLOW UP to the good ending so the WHOLE ending counts as 'complete'
[SPOILERS]
you just have to make sure that you meet shanice and priestbot again and go through the new dialogue options at the church. a new one will appear each day so repeat visits are necessary.
your specific steps are:
- achieve the good ending (obvi)
- go for a walk and meet mark (another priestbot)
- wait for 4 days and youll get a phone call from shanice
- wait 3 more days and go for a walk and youll meet priestbot
after shanice and priestbot return from the vatican, this is when the new dialogues will appear.
day 1: go to church, yap, pass the day
day 2: wake up, go to church, talk to shanice and youll meet priestbot after. DO NOT evade the question. DO tell him about her feelings. pass the day
day 3: wake up, go to church, complete the dialogue, unlock the service
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this is all information reformatted from the MDRG wiki :3c