The Legend of Heroes: Trails of Cold Steel (538680) fails to launch

steam-538680.log

Game fails to launch do to an
Unhandled Exception: System.NotImplementedException: The method or operation is not implemented.

Stacktrace:
Unhandled Exception:
System.NotImplementedException: The method or operation is not implemented.
at System.Drawing.Font.FromLogFont (System.Object lf, System.IntPtr hdc) [0x0009e] in <881e150859e047dba143982f9ad099a8>:0
at System.Drawing.Font.FromHfont (System.IntPtr hfont) [0x00029] in <881e150859e047dba143982f9ad099a8>:0
at System.Drawing.SystemFonts.get_DefaultFont () [0x0009e] in <881e150859e047dba143982f9ad099a8>:0
at System.Windows.Forms.Control.get_DefaultFont () [0x00007] in :0
at System.Windows.Forms.Control.get_Font () [0x00054] in :0
at System.Windows.Forms.ComboBox.get_PreferredHeight () [0x00008] in :0
at System.Windows.Forms.ComboBox.get_DefaultSize () [0x00000] in :0
at System.Windows.Forms.Control..ctor (System.Boolean autoInstallSyncContext) [0x000b1] in :0
at System.Windows.Forms.Control..ctor () [0x00000] in :0
at System.Windows.Forms.ListControl..ctor () [0x0000b] in :0
at System.Windows.Forms.ComboBox..ctor () [0x00059] in :0
at (wrapper remoting-invoke-with-check) System.Windows.Forms.ComboBox:.ctor ()
at Sen1Launcher.Launcher.InitializeComponent () [0x0001b] in <60e14b83d515423d9830173f7cc641e0>:0
at Sen1Launcher.Launcher..ctor () [0x00032] in <60e14b83d515423d9830173f7cc641e0>:0
at (wrapper remoting-invoke-with-check) Sen1Launcher.Launcher:.ctor ()
at Sen1Launcher.Program.Main () [0x0000b] in <60e14b83d515423d9830173f7cc641e0>:0

It should also be noted that this game is playable with WINE + DXVK on Lutris.

Distro: Arch Linux Kernel 4.18.5-arch1-1
GPU: GTX 1080Ti Driver 396.54
CPU: Intel i7 4790k
Proton 3.7-5 Beta

Start with the attached steam-538680.log and the System.Drawing.Font.FromHfont/Windows.Forms.ComboBox stack trace, using the stated Proton 3.7-5 Beta environment as context. Compare the failure with the reported Lutris Wine+DXVK result; done means The Legend of Heroes: Trails of Cold Steel launches under Proton without this exception.