We are thinking of enabling an easy way to download a dynamic VHD to reduce the download size, if that helps? Unfortunately, I don’t think VHD files compress that well.Stefan commented
resize the disk to minimum dynamic disk
Right now, we don’t plan to add this support but up-vote this and we could consider.
Thanks for the valid suggestion. Your feedback is now open for the user community to upvote which allows us to effectively prioritize your request against our existing feature list and also gives us insight into the potential impact of implementing the suggested feature