I will agree on the Bluetooth and Win10 issues. Rarely have difficulties linking things back up again in 7. May need to prompt it, but it usually hooks back up without issues, even after a lengthy Sleep. Can't say that about 10, where I often have to unpair and repair something to make it work. Then there's the time I can't get a Bluetooth thermal printer to work in 10...at all. Same thing works just fine in 7 (and it's not the driver, either, as I can get it to work when wired up).
As for the dongles, considered using Logitech ones with the Universal Receiver dongles. Those will let you re-pair devices to dongles, like I did to a trackball on a dongle I originally got with a keyboard.