AutoCAD offers a number of ways to accomplish something. It's not a matter of Autodesk improving this in the future. It is a matter of finding a way that works for you and the tool you are using.
A few options have already been offered, granted it seems like you want one that is as few steps as possible to eliminate potential error.
1. Extract the data as you already have and use what @ara_neresesian stated and use a function(macro) in Excel to strip off the suffix.
2. Since your unit will be the same for all these, you could use a field suffix and have the field attached to a value placed somewhere in your dwg. Then prior to extraction set it to a ".0" then extract and rest it back to m2.
3. Create a lisp routine to extract the data and strip the suffix off and generate the file.
4. Create a database link to the data that has the data in a database table somewhere, generate a sql statement or a view that provides the data without the suffix and summarizes the value for you.
You could go on and on with how many different ways you could do it.
There is a Customization section here as well where a lot of people will just write something up for you. What you are asking for is pretty simple, you just need to provide your block and the format you want it to result in.
Good luck,