Reassigning keys on Windows 10

Microsoft offer a free tool that allows you to create your own new layout. This is called the Microsoft Keyboard Layout Creator. The advantage with this is that it creates a file that is compatible with Windows and doesn't need any app software to work. You just place it on the PC that you want that layout for. What I like about it is that it allows you to completely kill unwanted keys.
It would be better if you shift all the characters on each key then you can swap the keys so they correctly display the function of the keys.

Being fat-fingered and mildly dyslexic I use an Autohotkey script running all the time to autocorrect my mistakes. Using the OP's examples, these could be corrected using a 2-line script::

Code:

:*:can;t::can't
:*:don;t::don't

At its simplest the format is ::mistake::correction (where the first set of double semi-colons denotes an autoreplacement action followed by the mistake/correction pair seperated by a second set of double semi-colons. Normally the autoreplacement action takes place after a space or ENTER... but if the first set of semi-colons includes a star (*) then the autoreplacement action is immediate.)

You can add any other 'mistakes' you want autocorrected by using the same format of course.

Alternatively, just :*:;t::'t will replace every instance of 'semi-colon then t' (;t) with 'apostrophe then t' ('t) immediately they are (mis-)typed (due to the preceding * operator).

Hope this helps...