Maybe you are misunderstanding the basic difference between the functionality of having a map installed as a PC ['MapSource'] Version and viewing the same map as an image file in BaseCamp.
Image files on a usb stick/sd card viewed in BaseCamp simply cannot be used the way a gmap installed version can. There is no way to transfer part of this map [or the whole of it] to a Garmin device using MapInstall the way an .img file can be generated and transferred from a gmap folder and you certainly cannot 'insert' anything into a map .img file in the way you are wanting.
Garmin simply does not make PC instal versions available for many Topos, including this one which is only sold as an image file preloaded onto a microSD card. The map page Requirements tab:
Code:
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