There shouldn't be any problems as long as your work is noncommercial and you adhere to the license. TT follows the licensing guidelines which you can find here: https://www.ironswornrpg.com/licensing
Viewing post in Ironsworn: Starforged - Time Traveler comments
Hi Lemunde,
I have added Time Traveller to the FoundryVTT Starforged Custom Oracles. you can find the module at https://foundryvtt.com/packages/starforged-custom-oracles.
Thanks!