As far as I can tell, GHOST is only used to mitigate high hash power loss when confirmation times are lowered to 15 seconds.
Orphaned blocks are very rare in Bitcoin.
https://www.blockchain.com/btc/orphaned-blocks?offset=0
Even if you somehow saved all this wasted hash power, you would only maybe increase hash power by less than 1%!!!
Read my comment here for more details.