I figured this out. The solution was to have you class inherit from : SendRazorEmail. Then inside your method create a new workflow and execute that workflow to send the custom razor email:

var workflow = new SendRazorEmail(
                _hostingEnvironment,
                _options,
                _httpContextAccessor,
                _fieldTypeStorage,
                _formService,
                _umbracoContextAccessor,
                _pageService,
                _workflowEmailService,
                _mediaFileManager,
                _fileSystems,
                _publishedUrlProvider,
                _logger,
                _placeholderParsingService,
                _prevalueSourceService,
                _fieldPreValueSourceTypeService)
                {
                    SenderEmail = fromEmail,
                    Email = toEmail,
                    Subject = "Your subject line goes here",
                    RazorViewFilePath = RazorViewFilePath,
                };

                workflow.Execute(context);