Adding Security.stripInaccessible to a flow

StripInaccessibleAction.cls

public class StripInaccessibleAction {
	public class Input {
		@InvocableVariable(
			description='The record to clean up'
			label='Record'
			required=true
		)
		public sObject record;
		@InvocableVariable(
			description='The access type to use'
			label='Access Type'
			required=true
		)
		// CREATABLE, READABLE, UPDATABLE, UPSERTABLE
		public String accessType;
	}
	public class Output {
		@InvocableVariable(description='The cleaned record' label='Result Record')
		public sObject record;
	}
	@InvocableMethod(
		label='Strip Inaccessible Fields'
		description='Removes fields that the the user cannot edit'
	)
	public static Output[] processRecords(Input[] requests) {
		Output[] results = new Output[0];
		Boolean hasPersonAccountsEnabled = sObjectType.Account.fields.getMap()
			.containsKey('IsPersonAccount');
		for (Input request : requests) {
			sObject record = request.record.clone(true, false, false);
			Boolean isPersonAccount =
				request.record.getSObjectType() == Account.sObjectType &&
				hasPersonAccountsEnabled &&
				record.get('IsPersonAccount') == true;
			AccessType recordAccessType = AccessType.valueOf(request.accessType);
			SObjectAccessDecision decisions = Security.stripInaccessible(
				recordAccessType,
				new List<SObject>{ record }
			);
			Output result = new Output();
			result.record = clearNullFields(
				decisions.getRecords()[0],
				recordAccessType,
				isPersonAccount
			);
			results.add(result);
		}
		return results;
	}
	static Set<String> standardPersonFields = new Set<String>{
		'FirstName',
		'MiddleName',
		'LastName',
		'Suffix',
		'Salutation'
	};
	static sObject clearNullFields(
		sObject record,
		AccessType recordAccessType,
		Boolean isPersonAccount
	) {
		sObjectType newSObjectType = record.getSObjectType();
		sObject result = newSObjectType.newSObject(record.Id);
		Map<String, Object> values = record.getPopulatedFieldsAsMap();
		Map<String, SObjectField> fields = newSObjectType.getDescribe()
			.fields.getMap();
		Boolean isInsert =
			recordAccessType == AccessType.CREATABLE ||
			recordAccessType == AccessType.UPSERTABLE;
		Boolean isUpdate =
			recordAccessType == AccessType.UPDATABLE ||
			recordAccessType == AccessType.UPSERTABLE;
		for (String field : values.keySet()) {
			DescribeFieldResult describe = fields.get(field).getDescribe();
			Boolean availableForInsert = isInsert && describe.isCreateable();
			Boolean availableForUpdate = isUpdate && describe.isUpdateable();
			Boolean skipPersonField =
				!isPersonAccount &&
				(field.endsWith('__pc') ||
				field.endsWith('__ps') ||
				standardPersonFields.contains(field));
			if ((availableForInsert || availableForUpdate) && !skipPersonField) {
				result.put(field, values.get(field));
			}
		}
		return result;
	}
}