Edit:
You were right, nro2nsp can also create forwarders !
I'll keep my original post below:
don't convert nro to nsp. it would create "full channels", not shortcut (forwarders).
The forwarder (or homebrew loader) has the advantage that you don't need to rebuild the nro after each new release of your homebrew, it'll always load the nro from SD whatever its version. It's easier to update, you can even use the appstore to update it and and still use your shortcut to load the updated homebrew right away.
For forwarders :
https://github.com/The-4n/hacBrewPack/tree/master/sample_hbmenu_loader
it's a forwarder to load sdmc:/hb_menu.nro
- replace reference to "sdmc:/hbmenu.nro" in the main.c
- replace the name and titleID in the first lines of hbmenu.json
- compile (install devkitpro, and type make)
if possible, follow the TitleID convention, don't end it with "1001" like the example. it's listed as DLC by some title managers.
https://wiki.gbatemp.net/wiki/List_of_Switch_homebrew_titleID
Alternatively, you can request one here :
https://gbatemp.net/threads/somes-usefull-homebrew-on-nsp.520775/