I had an issue where one keyboard (worked with another one) worked in bootloader, but not when entering the encryption password after that. I believe I solved that by moving keyboard earlier in the module list in mkinitcpio.conf. Maybe something similar would solve your issue?
While not really a budget tool per say, I’d recommend checking out Beancount if you are looking for a power tool and you are comfortable with a bit of Python. The only really manual steps I have in my setup is downloading transactions from my banks and categorizing any transactions that the machine learning plugin fails to categorize.