I have an old DOS Computer Algebra System program which uses the extended char set to display mathematical symbols.
Using the US codepage displays the correct mathematical symbols but there are a few symbols which are swapped.
For example, if I press shift+2, a @ symbols is displayed, similarly if I press the shift + @ a " symbol is seen.

Using the UK codepage retores these key functions an others as you would expect, but all the mathematical symbols are replaced
with the wrong character symbols.

I've been searching around but surprisingly I haven't yet been able to find a solution to this problem.

My thinking is that I need to create a custom codepage which containing most elements of both the US map with a few changes found UK keymaps.
Would this be the right approach or is there a far simpler way to do this?
Any assistance with this would be gratefully appreciated.

Thanks,
5aLIVE.