Hmmmm, some potential concerns with your itinerary. First is a very busy arrival day….things often do not work out so smoothly and timely in Nepal. Perhaps you will have transportation arranged or have no problem with laying out lots of taxi money…also you make no mention of getting an Annapurna park permit and/or TIMS, if the TIMS is still required for that trek. The check post for one or both is before Manang….or as you are a member of the S Asian group of countries maybe this does not apply to you. The other concern is the big altitude jump from Bangladesh to Manang (3500m/11500ft) in a very short time. This can lead to some trouble in some individuals. Also will you have made reservations with jeeps or are just going to wing it that morning? As I have always walked in from Behisahar I do not know how far the jeeps go in one day but as said a big altitude jump. I have not done the AC in a few yrs so not the most current knowledge…my suggestion, take you same msg and go Trip Advisor, Nepal country forum and post…I think you must register to post. It is likely you will get some good and current responses, and no touts allowed….mention if you will be using and agency to facilitate permits and jeep res, or not…also, it use to be for Annapurna in any case if you got your permits on the trail at the check post they charged double for one or the other…ask about this too. Happy trails.