Hi there,
I can understand and sympathise completely with what you are saying....
I think the most important thing to be aware of is this - old versions of Windows are staggeringly vulnerable, in part because they lack all of the very many (and effective) security mitigations modern operating systems have, and also because they may not be fully patched (depending on when support ends). What this means is that you are at a very high risk of catching malware - ransomware being the latest common tactic.
To mitigate this - make sure you have very effective backups. It is critical, when running old and insecure operating systems, that you are fully prepared at any time to have a ransomware attack which encrypts not just your internal hard disks but also any connected external hard disks and memory sticks as well.
If your disconnected, offsite backups are good enough, this should not concern you too much: get infected, wipe machine, reinstall, no big deal.
If this is a big deal - rethink, and rethink fast, before it is too late.
The best way to run Windows XP software on Windows 10 is to create a Windows XP Mode VHD, and then run it on a Virtual Machine. I personally like VirtualBox, which is free.
Instructions here:
Get official Windows XP virtual machine for Hyper-V
