To fix your problem it is very simple, do not use HarryBO210-1-2 perks ever. Instead, you can use Gympie's cool perks(your favourite scripter). You can make a new empty map, and copy your current map there, cos it will be clean and ready to use with no bugs and such, and then follow Gympie's tutorial to install his 'cool' perks. The tutorial is a little bit long, but his sexy voice compensates that. Here's the link https://www.youtube.com/watch?v=UVNGmUbbrh4&t=4s
Assuming that you're talking about the buildable icon for the power switch, can't you just make one by yourself? Use paint.net d00d, it literally takes 2min to make it. Or ask Gympie, he can give you one of his favourite shaders cos he likes a lot collecting shaders of different buildables.
so to change the sounds, pretty much what you need to do is to make new alias lines for each powerup or whatever you want to change. Let say i want to change the carpenter sound, i would name the alias - zmb_vox_ann_carpenter - in other words, Prefix + the powerup
Ignore this cos im kinda dumb and i posted it wrongly in this section. Go in the tutorial section and check it there till Gympie tells me how to delete this post because i don't see any frickin option.