Hi Lathroum
some time ago I was (more) into modding pins - the big problem is "when we want to sell a modded pin: People want to buy original - non-modded pins" ...
Here https://pinside.com/pinball/forum/topic/williams-jubilee-gi-lamp-fuse-pops-on-start-up/page/2#post-3251666 is the schematic " Jubilee " (I put the pieces together - if You want a copy then write) --- the topic is about "modding a Jubilee" - I suggested some mods --- the OP finally decided to "just add two posts" - see them in post-78 https://pinside.com/pinball/forum/topic/williams-jubilee-gi-lamp-fuse-pops-on-start-up/page/2#post-3257389 (?) --- later he sold the pin.

If You want to talk "modding Your Jubilee" I would start writing "adding a gate - adding a virtual gate - other mods -- we as well may have a look at Skylab / Spacelab https://www.ipdb.org/showpic.pl?id=2202&picno=51160 . Greetings Rolf