Catch-up maintenance on a 2014 Prius 141K

I bought my 2014 Prius (141K) three years ago (at 110K), and believe it to have been well-maintained. However, not sure about any of the bigger maintenance items. For my part, I bring it to a local mechanic for oil and brakes. I'm somewhat handy and can do the cabin air filter, the wipers, the 12V battery, and a headlight. I'm not up for the more significant engine maintenance. I've not had any problems with the car, other than one strange incident where the engine kept revving when decelerating on a cold day.

I've searched through the forums (thanks to all for these posts), and identified things I should do (either at 150K or already at 120K or earlier). I'm not sure my local mechanic is up for the more Prius-specific things, and so I contacted a dealer and got this quote:

-Synthetic oil and filter change $96.95 plus tax
-Spark plug replacement $499.95 plus tax
-transmission fluid service $249.95 plus tax
-engine coolant exchange $259.95 plus tax
-hybrid inverter coolant exchange $169.95 plus tax
As far as the final 2 services they are preliminary estimates without us seeing the vehicle in the shop:
-EGR pipe and manifold carbon cleaning $885 plus tax
-inverter water pump replacement $880 plus tax
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I'll probably call my mechanic and maybe one or two others to see if they can do these and for how much. In the meantime, I wondered about:
1. I would have thought that doing these together would be more efficient, require less shop time, and hence be cheaper. The dealer doesn't seem to be discounting for this. Would an independent shop be better in this regard?
2. Any thoughts on the appropriateness of this list would be appreciated, though I appreciate that I should (and did) search through the forums.
3. If, by chance, there are any Long Islanders reading this, any recommendations for a good shop would be appreciated. I didn't see any recs, but Amityville Garage showed up as hybrid specialists (reviews on Google didn't mention Priui). And so if anyone has experience with this shop in particular, that would be most appreciated.