I can see the stamens, it's a hermaphroditic for sure. I might help some brush pollination.

Kaffir limes are very cold resistant, down to -2C.
Now it depends on the plant origin. A grafted plant will not survive less then 5C. A rooted clone under 10C has problems with root rot. Most of the trees from nurseries are clones.
I tested many types so far perhaps 50 trees so far, including I brought a kaffir lime from Thailand, which eventually died. The problem with them it's a virus, once it's infected it won't survive longer than 10 years vs 100 years from a seed.
An indication is spots on the leaves, and the color of them a lighter green. But don't confuse it with chlorosis.
The best to start a kaffir lime is from seeds, they will be so strong and virus free. They withstand 40C and -2 C. Very drought resistant. However due to gene diversity perhaps 40% of the seeds germinated are wrong trees.  Also germinating the seeds is a challenge.

Cut all the leaves, keep it out of sun and warp it all.
It will do just fine in 2 months it's ready. Humidity is the key, don't let it dry.
Also I recommend a bath into copper oxychlorine to kill all the fungus on the trunk.

This is a dwarf specimen. In my option by the look at the fruits it seems to be an Indian GMO hybrid called 'Pusa Nanha' or a variation of that, that is the only one who sets flowers so low to the ground.

I overwintered my pineapple in basement at 50F for 3 months, they did just fine, not lose, but rarely watered them 2 times the whole winter. They are very hardy beasts.

Black Thai Ginger , Thai ginseng or krachai dum (Kaempferia parviflora) for sale in Europe, fast delivery no customs check, fresh harvested from my garden in Thailand.
Used for improvement of stamina and endurance.
Price is 45 euro/kg, shipping from 10 to 20 euro depending on location and service.

You can fertilize using  high potassium such as potassium nitrite KNO3 which is 13-0-46. The N will not induce so much new growth and the potassium will make the cells thicker and easier to get a cold snap. Use at a rate of 200 ppm K2O a week.

Is your  papaya in the picture called tainung 1?  Is it sweet ?
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Tainung was a hybrid developed in Taiwan. It is not Tainung, this is a heirloom papaya in northern Thailand passed down by generations, flesh is orange and very sweet. Some threes are even 20 years old. I need 3 days to eat one they are so big.
I believe is Khaek Dum somehow crossed with others, normally Khaek Dum is long and thiner.

For 9b zone from my trials (I am in zone 7b-8a), Thai papaya is the strongest (the strongest is Babaco, but it's not real papaya). I say this because I collected some seeds from northern Thailand where temperatures in the winter drop to 6-10C (40-50F). It will not die when is cold. BUT it needs to be dry. No wet feet. (actually there in 3 months it rains twice). They grow very fast, and make flowers around 1m (3 ft) tall. Hawaii papayas are very sensitive to cold, they root rot fast.
I have another method, I grow them outside in land during the summer then I cut the top off, root it and pot it. New flowers start close to the ground like 30cm (1ft), the root system is very shallow, and no more tap root, it's a method they use in Thailand.
Sure you can use mountain papaya as a rootstock for normal papaya ( I am going to make this soon and on other Vasconcellea speacies, I already successfully grafted papaya on babaco).
This is the papaya in Thailand, they weight 2-3kg, no virus present (should you want some seeds let me know, I carefully collected them and removed the sarcotesta individually, germination is 90%) :


and here is in my greenhouse, this is only 5 months old from seed:

I have more seeds left from Carica pubescens syn. Vasconcellea pubescens for sale. Germination instructions included.
Price is 3 Euro for 25 seeds. Postage 2 Euro, simple bubble letter. Payment by PayPal. Delivery time: Europe 2-5 days. USA/CAN: 7-15 days. Worldwide : 7-30 days.

Thai seeds germinated after 10 days, 100% germination. Bought the fruit in Thailand from a street seller. So it must be the irradiation.

Has anyone tried to grow krachai dum or Thai black ginger Kaempferia parviflora
Or anyone used it? It's said to significantly increase hand grip strength and enhance sexual stimuli.