Can I replicate my ohmyzsh setup?

[maribox]

Hey!
I am currently using oh my zsh with powerlevel10k and I quite like it and all but it has one major flaw - the zsh specific language quirks make it so I often can't paste code into it. And it drives me nuts. So I wanted to try to switch back to bash only to discover that the ecosystem looks a bit like these tumble weeds in western films or something (even though it's the default everywhere...).

I am now still trying to replicate my old zsh shell.
I try to adapt the powerline-multiline theme, but what can I do to make it diamond shaped on the left and right as opposed to the flat shape?
Also how to go about completion (e.g. I have completion inside the command with nix for example or git. Is there maybe some plugin that just handles all the important commands so I don't have to pick each command I want completion for? Also btw I use fzf in the screenshot, but I just want basically automatic completion everywhere)

Also I have some problems with the right side where it isn't aligned directly to the right (see here for example, compared with zsh:)

Here's some plugins I currently use in zsh:

romkatv/powerlevel10k

mattmc3/zephyr path:plugins/completion
Aloxaf/fzf-tab 

getantidote/use-omz 
zsh-users/zsh-autosuggestions
zsh-users/zsh-syntax-highlighting
zsh-users/zsh-history-substring-search
ohmyzsh/ohmyzsh path:plugins/git
ohmyzsh/ohmyzsh path:lib
ohmyzsh/ohmyzsh path:plugins/colored-man-pages
ohmyzsh/ohmyzsh path:plugins/safe-paste

and powerlevel config

Also I somehow can't get it to work that it shows the timing for commands? I don't know why...
currently I have this:

# BASH IT

BASH_IT="$HOME/.local/share/bash-it/"

# Lock and Load a custom theme file.
# Leave empty to disable theming.
# location "$BASH_IT"/themes/
export BASH_IT_THEME="powerline-multiline"

export THEME_CHECK_SUDO='true'

# Don't check mail when opening terminal. (????)
unset MAILCHECK

export SCM_CHECK=true
export BASH_IT_COMMAND_DURATION=true
export COMMAND_DURATION_MIN_SECONDS=0
export POWERLINE_RIGHT_PROMPT="in_vim clock user_info"

export BASH_IT_AUTOMATIC_RELOAD_AFTER_CONFIG_CHANGE=1

# Load Bash It
source "${BASH_IT?}/bash_it.sh"

Do you think something like this is completely reproducible in bash?