Can we switch from high skilled visa to humanities/engineer visa without changing the employer.?

I want to switch from Highly skilled professional visa to humanities/engineer visa. I understand that having high skilled visa have several merits but I feel that it stops me to switch jobs easily because we need to do some processes with immigration office and some time it takes 2months of time and new company might not wait for me that much of time. So can i switch back to engineer visa while i am working in same company.?

Also i have submitted PR application and currently its under process, so will this switch effect my PR application.?

by New-Anything-5145