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This is not a recommended planting solution.
If the mature size of these palms does not meet the needs of your landscape, it would be best to choose other another palm or plant for your area.
Check with the County Extension Office in your region. They will give you a list of palms or trees for your region.

http://www.south-florida-plant-guide.com/foxtail-palm.html
https://www.gardeningknowhow.com/ornamental/trees/foxtail-palm/foxtail-palm-tree.htm
https://www.gardeningknowhow.com/extension-search/

Never remove the green fronds from a Foxtail Palm.

https://www.gardeningknowhow.com/ornamental/trees/foxtail-palm/foxtail-palm-tree.htm

Palms usually do come back from damage such as this. Just give it some TLC and you should see new fronds in no time!

You may want to mulch the base of the tree. Also add a nitrogen rich fertilizer. This article will give you more information on the care of these: https://www.gardeningknowhow.com/ornamental/trees/foxtail-palm/foxtail-palm-tree.htm

Being too wet is usually the cause for this disease. I would cut back watering, or sterilize your water supply. If the water remains warm, or in a lighted condition, then it can easy be infected with a disease. It is best to keep the water cool, and in the shade if possible. You can use wettable sulfur on the tree itself to help control the rot. Peroxide can be used to keep the water fresh for longer.

Poisoning the roots would be an effective way to kill the tree, but would cause the tree to fall at an unpredictable time, which could be a safety hazard. Perhaps you could hire a neighbor to cut it down for a low cost? Some municipalities will cut down trees for free if they are a safety hazard, perhaps you could look into this.