Hi Steven,
For your scenario, simply upgrade your LTSC to Semi-Annual Channel. Any other suggestion is an unsupported workaround.
You can't install the Store on LTSC.
This edition of Windows doesn’t include a number of applications, such as Microsoft Edge, Microsoft Store, Cortana (though limited search capabilities remain available), Microsoft Mail, Calendar, OneNote, Weather, News, Sports, Money, Photos, Camera, Music, and Clock. These apps are not supported in Windows 10 Enterprise LTSB edition, even of you install by using sideloading.
Source:
https://learn.microsoft.com/en-us/windows/deployment/update/waas-overview
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