What modules for universal PowerBank can you recommend?

Question

Electronics

Good afternoon. I want to make an autonomous portable adjustable power supply.
Wishlist:
1) Support for fast charging for smartphones 2) 19V
channel for powering a laptop
3) Adjustable channel with a current of ~ 5A, ideally with current protection and indication

real capacity). Now the banks are connected in parallel.
I see several options.
1) Unsolder the banks and connect in series. On the plus side, you don't need a boost converter. Of the minuses - you need a balancer. Another minus - step-up converters are less common, as it seemed to me.
2) Step-up converter up to 20V, and step-down modules after it. Of the benefits - the balancer is excluded. Of the minuses - it will take a long time to charge, or you need to charge it from a computer PSU.
3) Perhaps there is something integrated into one universal module - with fast charging and discharging + buy PD cables for running 12V and 19V to this.
4) For hardcore: to breed the board and develop a circuit from scratch.

What do you advise?