Not sure about how to do this in Corel, but I would have thought that
changing your language settings to include an extra keyboard on the
language bar means you could switch between the 2 keyboards as required.
Most of the Spanish keys are the same as the English, so it would only be a case of
learning the new positions for ¿ ¡ Ñ ñ and the Alt + Numpad for the 5 vowels:
á = ALT + 0225
é = ALT + 0233
í = ALT + 0237
ó = ALT + 0243
ú = ALT + 0250
Hope this helps,
Saludos,
Bob.