Depending on your needs, tilemaker (https://github.com/systemed/tilemaker https://github.com/systemed/tilemaker) may be the least painful way for generating til

Depending on your needs, tilemaker (https://github.com/systemed/tilemaker https://github.com/systemed/tilemaker) may be the least painful way for generating tiles from OSM data with modifications to it. Or at least it seems to be the least painful way of doing that that I've found so far. The input data is manipulated by Lua code that you provide, and some reasonable default configuration for it exists. Your custom Lua code could pull additional information from other information sources should you wish to do so.