Not really. If it's essentially a standard ANSI set, then I'd prefer a compelling reason to use ÷ and × instead of the standard ANSI symbols / and *
(To be clear, if Triumph Adler GMK was made as an authentic reproduction, complete with German legends and ÷ and ×, I'd be fine with it. I just prefer consistency and sticking to a standard over some arbitrary novelty.)
This set is far from standard, just as the original Skidata was a GMK creation, without following any conventional standards, and contained a mix match of both English and DE ISO legends.
Despite not following any standards, I'd argue that the original Skidata set still turned out pretty good, and is well-loved.
Please keep in mind that when designing keyset legends, there will always be compromises made as it is not possible to include every legend out there to satisfy everyone.
The very least that can be done is to make sure there are enough keys with the correct legend-type, for every conventional layout to ensure max compatibility, which is how SKIDATA+ was designed.
SKIDATA+ will use "÷" and "×" for the numpad area.