Can I keep using my outer tube tyre with a hole in it
A thorn hole in an inner tube is totally patchable.  A 50 cent patch is a lot cheaper than a new tube.  Stop consumerism!

As for the hole, it depends if the inner tube pokes out or not.  The get-home fix is to line or reinforce that area with something laid between the tube and tyre.   

On one tyre I ended up adding a patch to the inside of the tyre, which worked well enough.  It lined up against the matching patch on the tube.