I would start with the characteristic hot Italian sausage seasonings.
Salt, black pepper, fennel seed, paprika, hot pepper flakes...maybe coriander.
I'd also probably add anise seed because the fennel may not have enough oomph to shine well in a cured loaf.
Then I'd follow the procedure for a cured, cooked, un-smoked (I assume it was un-smoked) luncheon meat.
http://lpoli.50webs.com/index_files/Zampone.pdf