PEI bed are 20€, not 100€.
Just buy a compatible one on amazon or elsewhere.
You just need to have the bed size somewhat correct, and the magnetic base have a sticky surface that will adhere on whatever is below your glass bed (usually some metal structure to hold the glass)

I’m starting to build a voron trident on it.
For now I stripped everything and only have the base frame.

tronxy x5sa-400

Ah you too decided to torture this printer.

You can calculate it !
Take your power usage and compute the cost over a year.
I will soon add a SSD because i finally moved from a RAID 1 to RAID 5 (so more HDDs), it consume more electricity.
I can measure how much power it draw because the server is on a smart plug. I calculated an additional 20-30€ a year of electricity, adding a SSD for read/write cache would allow the HDDs to stop spinning, make things faster and will be cost effective over a few years.

Consider that a new power efficient CPU may be cheaper by consuming less electricity over a few years!

When you are bored, backup a VM then hard kill it and see if it manage to restart properly.
Software should be able to recover from that.
If it doesn’t, troubleshoot.