Handyman for replacing the fixed shower head to a portable one

I need a handyman who can replace the shower head for me. The fixed shower head on top has the connector with 3.5cm diameter(picture1,2,3). I need to change this to be a portable shower head which I can hold on my hand to take shower (picture4,5). During the shower head replacement installation, the handyman should be OK to wear the mask all the time due to the COVID situation (I can provide mask). Please let me know your quote. Many thanks! Location is at London SE10.