I’m afraid I don’t know but I assume they will be open now but with social distance rules in place.

Other than the steps to get up to and down from the cave, the ground of the cave is smooth and even concrete floor. The path along the lake garden is even concrete too. It is not those nature trail.

It's still within Ipoh, so no problem getting Grab from there. In fact, it's easy to get a Grab in Ipoh. And there's temple staff manning a counter/office near the entrance you can go to for assistance, if needed.

No but you can carry the person up the stairs and let them sit then you can carry the wheelchair and you can show them around.

we took a grab to go there. It did not wait, but we found another grab very easily to go to another caves. Do not bother ask the driver to wait for you. We visited the place for something like 30 minutes

There is a big parking lot where bus & cars are parked and it is sandy definitely you cannot carry out your activities there so there is no choice for you other then to have your activities at the zen gardens and it also depends the type of activity as it should be a very simple one for e.g, have them seated in a circle put a handkerchief behind anyone of them and run around and maybe like 10 children standing in a row passing a balloon filled with water backwards from the front child to the 10th child at the back something like that it is my opinion only.you can think of something when you are there yourself

The roads are wide enough for a Tour bus to drive in and the car park is pretty large.

The entry is free, you can buy some fish food to feed the carp. I believe the local businesses and community upkeep the temple through their patronage. You may make offerings and it is strictly voluntary.

The answer is no to both questions. The temple is bright and has natural openings both at the front and back of the cave providing enough natural light. In the darker area, there are lamps to provide lighting. I don't see any bats in the cave and there is no sign or smell of guano.

Buses from KL usually go into Amanjaya Bus Terminal which is around 15 km from the city center. Taxis from the bus terminal to the city center will generally be 20 to 30 Ringgit one way (if you look straight up like a tourist). You might be able to talk to a taxi driver and see if they'd be willing to take you to the temple and back to the city for that much (though I highly doubt they'll do that for less than 40 ringgit). Another option is to take the public bus from Amanjaya to the city center (they're supposed to have free shuttles but otherwise, the cost is around 4 ringgit). From the city center you can find a taxi and see if you can go to the temple roundtrip for aroubd 20/25 ringgit. Last option: If you have the uber or grab car app on your phone, that'd be a cheaper/easier alternative.