Hi,
I went through your project brief and here is what i propose:
1. Instead of Access, Filemaker, Sharepoint, Excel lets go a proper SQL based online database. It would have several advantages over these like much higher security, faster to access and ability to import large data sets very quickly among others. Please note that access and Excel files are prone to corruption too and that is most certainly not the case with SQL.
2. We will develop a backend layer to easily update/edit this sql database which would also be web accessible .
3. We will additionally write routines to directly import the excel file into this online secured db.
4. We can start immediately.
I am accessible via multiple communications like phone (local US), Skype, Voip, email, text chat etc.. during ongoing projects.
As you can see from our profile we are widely experienced and certified coders here with over 10 years of experience creating successful web applications. We have a near perfect project completion ratio and bank on our ability to form successful long term relationships. Please check our past work reviews for feedback and references.
I look forward to hearing from you.
Regards
Rohit