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Please read the following

https://www.indusface.com/blog/protect-arp-poisoning/

You will see, that protecting against ARP spoofing can include several things

1. using ARP spoofing detection tools
2. using static ARP entries
3. using cryptography at higher levels (TLS)

ARP spoofing detection tools

https://github.com/shawnanastasio/arpspoof-detect
http://www.xarp.net/

Static ARP entries

Not sure why that does not work in your environment. Your questions/description does not contain information to answer that.

Cryptography

Using proper cryptography at higher levels, like TLS or IPSEC, will render ARP spoofing useless.

Regards
Kurt