That's not what I understood from your last post. I though you suggested to convert 10 feet into 10 meters. That way you're altering the perception about the reality of the game world. For instance, I doesn't make sense to say a medium humanoid dominates 5 meters of space in combat. So, I can't stand behind this. If you want to do that, you can easily change the words on the fly and that won't mess with any rules, like encumbrance, movement, travel, jump, etc...
Now if you want more clarity, in order to help yours players envision the battlefield for instance, but still have some precision in the conversions, you can't say everything is just a unit after all! Here we come to my previous comment, you have to deal with weird broken numbers, rounded numbers, approximations, etc... And that's fine too. But in this way you have to face you're dealing with a balance between precision and easy of play. That balance is already built into the system and its imperial units. In order to convert this you may have to deal with some compromises in one aspect or the other.
Because there are other units in the game like ounces, gallons, pinch, miles, pounds, and the conversions are not straightforward game-wise. That said, I'm not against the translations including conversion tables or values as I said. I just like to have the original reference in front of me.
For that part I was just repeating what a different person had said for an easy way to convert things, without all of the math. I can agree that the best way to handle it would be to have both, but I assume that would increase page count somewhat, and possibly make things somewhat confusing. They would either need a single page full of conversions that all mentions of a measurement could point to, or follow every measurement with a parenthetical like "Your speed is 30 feet(9 meters)". It almost makes it understandable that they have not done such a conversion yet.