Replace Chain Tensioner, gasket and Timing Chain(s), and associated guides ?

Not sure about your list; maybe just replace if warranted, when it's opened up?

I would get the Toyota gasket kit, includes head gasket and all the pliable seals. gaskets, o-rings. That's around $200~250 IIRC. Also replacement head bolts, just to play it safe. A set is around $100?? Part numbers for both in the attached.

There's a couple of head gasket related links in my signature.

 

Take an honest look at what $11k can buy you on the market today. From my end of the world... it's not great. Do you see a better deal? Is financing [your transportation problem] somehow more palatable?

That's what you need to be thinking about.

You'll get better prices thru cross-shopping, but they could involve long distance towing to begin the repair, no free lunch. I still recommend any independent shop before Toyota dealers- but it's best if they already have real hybrid experience.

Good luck!

 

Phone around and see if you can get a replacement engine [jap imported]
Then sell off your old engine


Generally these things are so reliable that the engines are cheap

In NZ I can get a 1nz-fxe from a dismantler for NZD $500 [USD $300] with a 3 month warranty.
Trade Me