Anon, even in Yerushalayim, the only place karbanos are allowed is the Bais hamikdash – it’s an open pasuk. Before there was one, ot was shaas heter habamos, a time when bamos, personal mizbechos, were allowed. The circumstances changed and the din of shechitas chutz kicked in, as it was always going to. No change there.
And the seforim, and religious jews, call ksvav ivri by the name it was called by the rishonim. Your use of the term Paleo Hebrew just shows what miasmic internet stuff you’ve read.