Ok so 3 thingsMake a menu yourself, there’s plenty of tutorials for gsc and then to load them you could use infinityops or infinity loader.
Infinity loader does support bo1 it was added in the latest update along with waw,bo2 and then bo3 for pcOk so 3 things
1 - https://prnt.sc/v967ng - Infinity loader DOES NOT support BO1 also requires payment.
2 - Unless you have somewhat dev experience (i do not) the speed code tutorial(the only ones i can find) are utterly useless when you don't understand them
3 - infinity ops is more tailored to xbox and does not include an injector https://prnt.sc/v96a6c (the ONLY thing im missing) to be at all useful for my situation.
So here i am right back to square one.
P.S do not suggest downloading the extreme injector that was mentioned in the article the program from what i can find is extinct any and all links ive found are rats.