Hey i have a challenge for Hercules to be sane and be summoned not as berserker but as Saber or Archer Ilya is to still to be his master you can have them get along immediately or wait a bit to do so. If you choose him to be Archer then EMIYA obviously cannot be and might not be summoned you can choose another servant if you wish to be Archer.
If Hercules is Archer then he should have the nemean lion pelt just remember it is essentially impossible to pierce the hide so nothing much could except something like an Excalibur blast or be gotten past by huge blunt force should also have his hydra poison tipped arrows and his golden sword from stats of the weapons you can choose.
If he is Saber then of course Arturia is not going to be Saber if you choose him as Saber then. He will again have the nemean lion pelt and you can choose between his golden sword or the sword of veracity which you could have some fun times with its ability to make people tell the truth if it is pointed at them. He will also be able to use nine lives blade works as Saber.
Also because he has his sanity he will be able to use his mind and create plans and be more intelligent in the war than just randomly charging people.
Also he will keep god hand as if he doesn't Archer would still destroy him even if he has all his skills as he would at least get hit a few times before he can do real damage. There could also be some interesting meetings between Hercules Medusa and Medea since they all come form the same time period.
Well that's it what do you guys think? also send me a message if you wanna do this so i can read it :) this is my first ever challenge so i would like to know what you guys think. Peace!