Finally there is an option of read-only attaching a virtual disk file. Really good feature for taking a quick look into virtual disk without risk of changing anything.
Version is available at https://www.medo64.com/vhdattach/beta/.
P.S. Final 2.10 version has no timeline since I do have to pay my bills and that kind of work takes priority. You can always donate some money to speed me up. :)