Quickest way for approval Conventional loan “gift” down payment

[Rayven Likely]

Hello BP community! This is my first post here. Probably a very amateur question… I am looking to purchase my second rental property very soon. I will be getting the mortgage in my name, but my fiancé is covering the down payment ($25,000-$50,000). Are my only options to 1. Have him deposit the funds into my account and wait 3 months to get pre—approved, since I will have to submit my last two bank statements? or 2. Get the mortgage in his name (not my preferred option) ? Any advice is appreciated. Thank you.