Any platforms that support both INR and USD funding for investing in US stocks as an NRI on H1B?

My brother is currently in the US on an H1B visa. His main investment portfolio is in India, but now he wants to start investing in US stocks as well. He’s looking for a platform that allows investing with both USD (direct from US account) and INR (from India) — without forced currency conversion like INDMoney, which only supports INR funding and auto-converts to USD. Are there any platforms that support funding and investing in both currencies separately?