What date was the eea family permit granted?
His visa will still be valid and your obtaining British citizenship should not affect his status as you are still an eea citizen and the European rules would still apply.
He would be eligible for permanent residence 5 years from when his eea family permit was granted.
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I disagree because you do n9t stop becoming a Polish national because you have acquired uk citizenship and Poland is still part of the EU. As long as you hold Polish nationality, you are still an EU citizen.
if you were to withdraw your application, that should not affect any application you make in the future.
I would suggest that you withdraw now before it gets to ceremony stage.
There is no legislation that I have come across which states that EU regulations did not apply to you. Further, if they did not, UK citizens using the Surinder Singh route would not be able to do so.
If it worries you, I would suggest withdrawing your application and waiting until your spouse has obtained PR.
if you had an issue provide treaty rights in the future, it may affect his application.
If your application has already been approved, you would have to relinquish your new nationality.
The surinder singh route only applies if you are returning to the Uk after having exercised treaty rights in a 3rd party member state.
Your question will not close and I will be happy to answer any follow up questions.
Yes you should be able to do so but you will have to submit a new application and ensure that you meet all the requirement of the rules.
The time spent under the eea rules should count towards the 10 year in ANY category rules.
Therefore, I am of the opinion that he would be eligible to apply.