Create custom command for Simulink, allowing you to call addblocks.m from the Toolbox or using a combination of keys. See the explanation: https://www.makerluis.com/3-keyboard-macros-to-speed-up-your-simulink-workflow/

sl_customization.m

function sl_customization(cm)
    cm.addCustomMenuFcn('Simulink:ToolsMenu', @getMyMenuItems);
end


function schemaFcns = getMyMenuItems(~)
    schemaFcns = {@autoAddBlocks};
end

function schema = autoAddBlocks(~)
    schema = sl_action_schema;
    schema.label = 'Batch Add Blocks';
    schema.statustip = 'Batch Add Blocks';
    schema.accelerator = 'Ctrl+Shift+w';
    schema.callback = @autoAddBlocksCS;
end


function autoAddBlocksCS (~)
    addblocks
end