hi mate, sorry to hear about this but as you said it could have been alot worse!
1 - The quality of a repair by the bodyshop(hogans i take it) should be as new. i have only heard good things about the but as you say they arent cheap.
2 - I would stay with lexus especially as the car is that new. i would not trust the car, especially such a specific repair with someone else. And as you know there is not alot of choice in galway either.
3 - I dont think you should just patch it, i dont know how it would be sealed etc...
4 - The quote seems very expensive, but hogans are a rip-off on labour costs anyway. I dont think it would be 15 hours labour.
- A possible remedy is stripping the carpets etc. yourself which is not as daunting as it seems which may reduce the labour
- Try and source the parts elsewhere but this will be hard on a new model.
- I would try a differant dealer such as dublin because the galway one is renound for over-pricing repairs etc.
Sorry if i wasnt much help but Good luck in getting it sorted and nice to see another galway member on here!