Ilford Multigrade IV Gloss in Ilford Multigrade Developer followed by ten minutes in KRST 1+5.
Selenium makes that green tint go away, takes it a lovely rich black, and should be pretty archival.
Trouble with warmtone is it goes red. Can look lovely with just the right picture in a split tone sort of thing but for full permanence, with every picture, I'd rather have B&W than Red & White. Personally. But if it's what you want...
When I do want something warmer now my choice is to Sepia tone the MGIV. Just lovely. With the right print.
As to Developers. I finally got my hands on the Ilford Warm- and Cool-tone developers. Spent an entire night testing all combinations of them and plain jane Multigrade and the MGIV and MGWT papers. And, oh yes, the differences were dramatic. Until I dunked them in Selenium, after which there was barely a difference between the developers. So as it does its work in two minutes rather than three and comes in five litre bottles I decided to stick with the Multigrade.
But whatever choice you make, welcome back to the darkroom and hope you have yourself some fun.