Map Apple modifiers (Ctrl, Option, Command) to Windows modifiers (Ctrl, Win, Alt) in Citrix Workspace using Karabiner Elements, with working Alt+Tab and Windows key shortcuts

citrix_shenanigans.json

{
    "title": "Citrix Receiver/Workspace shenanigans",
    "rules": [
        {
            "description": "In Citrix, change left_option to Alt key via \"⌘⌥ Command (left)-Option\"",
            "manipulators": [
                {
                    "from": {
                        "key_code": "left_option",
                        "modifiers": { "optional": [ "any" ] }
                    },
                    "to": {
                        "key_code": "left_option",
                        "modifiers": [ "left_command" ]
                    },
                    "type": "basic",
                    "conditions": [
                        {
                            "type": "frontmost_application_if",
                            "bundle_identifiers": [
                                "^com\\.citrix\\.XenAppViewer$",
                                "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                            ]
                        }
                    ]
                }
            ]
        }, {
            "description": "In Citrix, change right_option to Alt key via \"⌘⌥ Command (left)-Option\"",
            "manipulators": [
                {
                    "from": {
                        "key_code": "right_option",
                        "modifiers": { "optional": [ "any" ] }
                    },
                    "to": {
                        "key_code": "right_option",
                        "modifiers": [ "left_command" ]
                    },
                    "type": "basic",
                    "conditions": [
                        {
                            "type": "frontmost_application_if",
                            "bundle_identifiers": [
                                "^com\\.citrix\\.XenAppViewer$",
                                "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                            ]
                        }
                    ]
                }
            ]
        }, {
            "description": "In Citrix, change left_command as well via \"Send Windows logo key using ⌘ Command (right)\"",
            "manipulators": [
                {
                    "from": {
                        "key_code": "left_command",
                        "modifiers": { "optional": [ "any" ] }
                    },
                    "to": {
                        "key_code": "right_command"
                    },
                    "type": "basic",
                    "conditions": [
                        {
                            "type": "frontmost_application_if",
                            "bundle_identifiers": [
                                "^com\\.citrix\\.XenAppViewer$",
                                "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                            ]
                        }
                    ]
                }
            ]
        }
    ]
}