Export-MS-Project-to-MS-Excel VS VBA-General

If needed, you may use: https://github.com/PopovGP/Export-MS-Project-to-MS-Excel

What are you doing with this project overall? (Also you can view more of where those functions came from here)

If the four lines of code are literally to identify the bottom left most cell of data on a sheet, then functions for that already exist. The GetLastRow function from that module would be the code you'd reuse.

This would certainly be simplest with launching from a userform stored in Excel. You could make it more fancy and look like a standalone application with extra code libraries but they wouldn't be necessary.

Here's a module I use for generating hashes. It can handle SHA256/512 which is entirely overkill for this, but it's simple and easy. To generate a hash, concatenate all the fields of a record together and pass that to one of the SHA_String functions.

Ah, I ran into this problem years ago so I created the RangeFindAll function to do the work for me. It operates on the same idea as when you use CTRL+F to find a value on a worksheet. It loops through everything it finds and adds each cell to a range reference, then spits that out once it realizes that it has looped through all cells with that value. Here's an example of how simple it is to work with:

This email class may be of use to you OP. Using it is super simple like so:

As for data entry/manipulation and user-friendly interfaces, that would be a lesson on good UX practices, which you probably can find articles written about it by googling. Honestly, the most I can really offer you is code from my library that I use in all my projects.