You can create your own DataSubmissionService 

i.e. 

    public class CustomDataSubmissionService : DataSubmissionService
    {

        public override SubmitActionResult PerformDataSubmit(NameValueCollection rawSubmittedData,
            HttpContextBase httpContext, 
            ControllerBase controller)
        {

                context.StructureMap().Configure(c =>
                {
                    c.For<DataSubmissionService>().Use(new CustomDataSubmissionService());
                });

Hi!

But if I remove the honeypot form field in the overridden PerformDataSubmit method I guess I won't be able to check if the honeypot form field has a value or not in my HoneypotActor.

It's in the HoneypotActor I check if the honeypot form field has a value (probably a spam robot has filled it in). If it has a value I cancel the submit.

I only want the honeypot form field to be excluded from "#summary" and stored form submissions.

public class HoneypotActor : PostSubmissionActorBase, ISyncOrderedSubmissionActor
    {
        public int Order => 1;

        public override object Run(object input)
        {
            var formContainerBlock = FormIdentity.GetFormBlock();
            var formElements = formContainerBlock.Form.Steps.SelectMany(st => st.Elements);
            var honeypotElements = formElements.Where(elem => elem.SourceContent is HoneypotElementBlock).ToList();
            if (honeypotElements.Any())
            {
                foreach (var honeypotElement in honeypotElements)
                {
                    if (!string.IsNullOrEmpty(SubmissionData.Data[honeypotElement.ElementName]?.ToString()))
                    {
                        var formId = formContainerBlock.Content.ContentLink.ID;
                        var result = new SubmissionActorResult
                        {
                            CancelSubmit = true,
                            ErrorMessage = LocalizationService.Current.GetString("/blocks/honeypotelementblock/errormessage")
                        };
                        return result;
                    }
                    
                    //Remove data for HoneyPotElement from final data.
                    SubmissionData.Data.Remove(honeypotElement.ElementName);
                }
            }

            return "";
        }
    }

Best regards

Kristian