diff --git a/backend/FwLite/FwDataMiniLcmBridge/Api/FwDataMiniLcmApi.cs b/backend/FwLite/FwDataMiniLcmBridge/Api/FwDataMiniLcmApi.cs
index c40403ba9..862807ad1 100644
--- a/backend/FwLite/FwDataMiniLcmBridge/Api/FwDataMiniLcmApi.cs
+++ b/backend/FwLite/FwDataMiniLcmBridge/Api/FwDataMiniLcmApi.cs
@@ -195,7 +195,11 @@ await Cache.DoUsingNewOrCurrentUOW("Update WritingSystem",
             "Revert WritingSystem",
             async () =>
             {
-                var updateProxy = new UpdateWritingSystemProxy(lcmWritingSystem, this) { Type = type }; // TODO: Doesn't compile, wants Font to be set. Also wants a GUID Id which we don't have...
+                var updateProxy = new UpdateWritingSystemProxy(lcmWritingSystem, this)
+                {
+                    Id = Guid.Empty,
+                    Type = type,
+                };
                 update.Apply(updateProxy);
                 updateProxy.CommitUpdate(Cache);
             });
diff --git a/backend/FwLite/FwDataMiniLcmBridge/Api/UpdateProxy/UpdateWritingSystemProxy.cs b/backend/FwLite/FwDataMiniLcmBridge/Api/UpdateProxy/UpdateWritingSystemProxy.cs
index ee67bcf43..eaf849fcb 100644
--- a/backend/FwLite/FwDataMiniLcmBridge/Api/UpdateProxy/UpdateWritingSystemProxy.cs
+++ b/backend/FwLite/FwDataMiniLcmBridge/Api/UpdateProxy/UpdateWritingSystemProxy.cs
@@ -1,7 +1,9 @@
+using System.Diagnostics.CodeAnalysis;
 using MiniLcm.Models;
 using SIL.LCModel;
 using SIL.LCModel.Core.WritingSystems;
 using SIL.LCModel.DomainServices;
+using SIL.WritingSystems;
 
 namespace FwDataMiniLcmBridge.Api.UpdateProxy;
 
@@ -11,10 +13,14 @@ public record UpdateWritingSystemProxy : WritingSystem
     private readonly CoreWritingSystemDefinition _workingLcmWritingSystem;
     private readonly FwDataMiniLcmApi _lexboxLcmApi;
 
+    [SetsRequiredMembers]
     public UpdateWritingSystemProxy(CoreWritingSystemDefinition lcmWritingSystem, FwDataMiniLcmApi lexboxLcmApi)
     {
         _origLcmWritingSystem = lcmWritingSystem;
         _workingLcmWritingSystem = new CoreWritingSystemDefinition(lcmWritingSystem, cloneId: true);
+        base.Abbreviation = Abbreviation = _origLcmWritingSystem.Abbreviation ?? "";
+        base.Name = Name = _origLcmWritingSystem.LanguageName ?? "";
+        base.Font = Font = _origLcmWritingSystem.DefaultFontName ?? "";
         _lexboxLcmApi = lexboxLcmApi;
     }
 
@@ -49,10 +55,15 @@ public override required string Abbreviation
         set => _workingLcmWritingSystem.Abbreviation = value;
     }
 
-    // TODO: Change WritingSystem Font property to be a list of strings instead of a single string, then do something like this
-    // public override required List<string> Fonts
-    // {
-    //     get => _workingLcmWritingSystem.Fonts.Select(f => f.Name).ToList();
-    //     set => throw new NotImplementedException();
-    // }
+    public override required string Font
+    {
+        get => _workingLcmWritingSystem.DefaultFontName;
+        set
+        {
+            if (value != _workingLcmWritingSystem.DefaultFontName)
+            {
+                _workingLcmWritingSystem.DefaultFont = new FontDefinition(value);
+            }
+        }
+    }
 }
diff --git a/backend/FwLite/MiniLcm/Models/WritingSystem.cs b/backend/FwLite/MiniLcm/Models/WritingSystem.cs
index 253f2dc28..e23627cd7 100644
--- a/backend/FwLite/MiniLcm/Models/WritingSystem.cs
+++ b/backend/FwLite/MiniLcm/Models/WritingSystem.cs
@@ -6,7 +6,6 @@ public record WritingSystem: IObjectWithId
     public virtual required WritingSystemId WsId { get; set; }
     public virtual required string Name { get; set; }
     public virtual required string Abbreviation { get; set; }
-    // TODO: Font will need to become Fonts, a list or array of strings, to better match the LCM model
     public virtual required string Font { get; set; }
 
     public DateTimeOffset? DeletedAt { get; set; }