Interesting! Thanks for sharing. Yes, some old Saroops have Mahalla 10 for that one Salok in Salok Mahalla 9 but most Saroops don't have it. As per our currently accepted Saroop, there is no Mahalla 10 in Siri Guru Granth Sahib jee and to steer clear of any new controversy we should keep it this way.
Regarding using snake skin to ward off insects, it's an interesting way of doing so but it is said that snake skin attracts snakes as well. If it's true, then you way ward off some insects but attract Cobras, which is not a great idea.
Kulbir Singh