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You need to know if you have English or Boston ivy or some other type of ivy. English ivy leaves will make a dog sick if eaten. Here is a link to ASPCA info on English ivy. Your vet is also a good source of information. https://www.aspca.org/pet-care/animal-poison-control/toxic-and-non-toxic-plants/english-ivy

The telephone pole may be an electrical utility pole, so be sure that what you are planting will not cause a problem or a hazard by growing up into the conductors. Or that after your planting time and investment, the utility company removes the plants and charges you for the obstruction.

Instead of ivy on the pole itself, consider planting a tall columnar form tree on your property, in a position that will block the pole from your view.

https://www.bing.com/images/search?q=columnar%20trees%20for%20privacy&qs=AS&form=QBIR&sp=3&pq=columnar%20trees%20for%20&sk=AS2&sc=8-19&cvid=74B9B3EBF8144CB995CFBC4C7BAEE61C

I don't have first hand experience with a situation exactly like yours, so I'm 'educated' guessing, but here is what I would do:

Talk to the pest control company that is doing the fumigation. In California they are required to have a licensed applicator supervisor who knows the products being used and environmental hazards. He/she may have had experience with plant protection like this. If not, the state Structural Pest Control Board may be able to direct you to someone who does. https://www.pestboard.ca.gov/
Also, the UC Extension may be of help.
http://cesanluisobispo.ucanr.edu/about/contact/

Find out exactly what they will be using and if it will kill the stems of the ivy. It may just burn the leaves and the plants may refoliate in spring.

I wouldn't count on neem oil for a protective coating, but consider this product: https://www.amazon.com/gp/product/B01LZ2O26A/ref=s9_dcacsd_dcoop_bw_cr_x__a_w

Protection from termite fumigation chemicals is not the normal use for this material. Contact the manufacture for pros and cons.

Here's some general information, although the article does not address your situation where you cannot move or protect the ivy attached to the home.

https://www.gardeningknowhow.com/plant-problems/pests/pesticides/protecting-plants-fumigation.htm

I think people are divided on this question. Because swedish ivy is easy to propagate, you can probably skip the rooting hormone. It may increase your success rate somewhat but we started propagating plants long before rooting hormone was available. Good luck.

Just bring them in out of the cold. Give them less water than they would get outside, and don't cut any dead leaves until they have plenty of new growth to replace them. This will just be a waiting game from here.

It is likely that the pH around the plant is off. You can use dolomitic lime to help with this. The next guess would be a pest. Have you noticed any webbing, or insects?