First you need to take permission from your real estate broker further I dont think all companies are going to allow you to do both services for an individual client. If you are willing to take real estate broker license must consider grel org for doing this.
This is possible and certainly legal. According to me, no matter who provides you Real Estate or Financing services. But you still must perform your due diligence in making sure they are not taking advantage of you. So, you should talk with past clients, and check their license status on RERA Website.