Mobile ios application development

My application has been developed. I have a few iPhone apps that I need to use internally

I need you to help me solve the problem

1: Help me distribute apps internally.

2: I only want my designated employees and customers to use

3: We do not accept the use of testflight

4: Please note that when I say internal distribution, I do not mean uploading apps the app store

I can't provide an apple enterprise program

If you can help me solve this problem. I can meet your needs in terms of expenses.