The https://github.com/blackjetrock/ghidra-6303 repository your post links to (containing a SLEIGH spec for the HD6303) is no longer available, did you happen to save a local clone that could be re-uploaded somewhere?
Thank you for finding this! Depili does great work! In another comment I mentioned that I've been working on the Casio CZ-101, which uses the NEC μPD7810 processor. Depili created a processor spec for the μCOM-87 architecture, which I've continued working on in this PR: https://github.com/NationalSecurityAgency/ghidra/pull/7930