how to increase Remaining Url length of Episerver URL link type

Hi there,

I have tried all the below solutions I found on EPi forums.

Also tried adding a custom backing type and still the max length of characters I can put in the Remaining Url field of Episerver Url property is 407 but I need atleast 500 characters there.

<httpRuntime targetFramework="4.6.1" requestValidationMode="2.0" enableVersionHeader="false" maxRequestLength="51200" executionTimeout="300" maxUrlLength="10240" relaxedUrlToFileSystemMapping="true" maxQueryStringLength="2097100" />

also tried maxUrlLength - 1024/2048 & maxQueryStringLength-65536 but same output!!

also based on some other references tried below -

<requestFiltering>
<requestLimits maxUrl="30000" maxQueryString="209007151" maxAllowedContentLength="204800000" />
</requestFiltering>

nothing so far!!!

Created Custom Backing type like below - 

[PropertyDefinitionTypePlugIn, Serializable]
	public class PropertyUrlWithLength : PropertyUrl {
		public override int MaxLength {
			get {
				var section = ConfigurationManager.GetSection("system.web/httpRuntime") as HttpRuntimeSection;
				return section?.MaxUrlLength ?? base.MaxLength;
			}
			set {
				// Cannot set from code.
			}
		}
	}

And then, on your property declare it like this:

[Display(Order = 11), BackingType(typeof(PropertyUrlWithLength))]
public virtual Url ButtonUrl { get; set; }

What am I missing here and what else can I do to acheive longer URL length.