A few pieces look salvageable, but you have to take out everything that's dehydrated and dying. How big is the pot? I would soak the pot for about 2 hours in a sink of tepid water, let it drain, then create a humidity dome. If you have a nursery nearby, you can go buy one. They look like this:

They cost about $7 or so for both pieces. Put a little water in the bottom - just enough to cover the bottom, not so much that it comes up over the ridges. Then set this in a bright room, not close enough to a window to get any direct light. Then it's just a matter of waiting to see if it will work. I've seen dehydrated leaves come back and plump up. It can take anywhere from a couple weeks to a couple months. All plants have a point of no return, but it never hurts to try as sometimes it isn't as bleak as you think!

Once it's revived, grow it in a pot a little bigger than the rootball. Let it dry SLIGHTLY between waterings. This means water it as it approaches dryness, never letting it get bone dry. Water until it comes out of the drainage holes, but don't let it stand in the drainoff. Don't worry about moving them around - a lot of mine are taken down every week to water over the sink, and I'm never concerned about moving one to a new location and exposure. They're tough plants. And they should be grown close to a window, some direct sun is great as long as it's not a south exposure, which is a little intense for them.

Denise in Omaha

lol. i thought this post was sorta funny. don't mean to make light of your situation.

i think some hoyas are fine in direct light and others not so much.

i have a small carnosa krinkle 8 which started to wilt in west facing direct light (just a couple of hours a day). when i moved it to another part of the room, away from the window but still in light (my apt is very bright without artificial light), it rebounded.

but my rotundiflora was dropping/aborting leaves until i moved it closer to the window where it would get the same amount of direct sunlight the krinkle 8 hated. now the rotundiflora (and me) is happier. my pubicalyx is going absolutely berserk (in a good way) sitting at the window too.

but there is no low light in my apt, just indirect light and direct light - all really bright.

i let the krinkle 8 i have dry out, almost completely. it also does fine sitting behind a bigger plant near the window. so i guess that would be filtered light, in a way.

It is a Hoya tricolor and they like high light. Mine is hanging in an east facing window and gets filtered light through the sheer curtains. It loves it over there and is growing like crazy and putting out new leaves. It will usually get wrinkled leaves and that is how i know that it is dehydrated and wants water. If you over water you will get yellow leaves. I would take cuttings just in case. I'm not sure about transplanting your Hoya tricolor as it might stress it out even more and it could die due to transplant shock.