The phrase "although basically" is correct and usable in written English.
It can be used to introduce a contrast or qualification to a statement, often implying that the following information is a simplification or generalization.
Example: "Although basically a simple concept, the theory has many complex implications that require further study."
Alternatives: "even though fundamentally" or "despite being essentially".
The show, although basically an impressionistic collage, may carry a message after all, a dismaying one.
Although basically military, the banners were also units of administration and taxation for the Manchu people.
Although basically a traditionalist, he was in many ways ahead of his time.
Although basically Turkic, the Khazar state bore little resemblance to the other Turkic empires of central Eurasia.
Although basically trained as an ornithologist, Rensch quickly developed as a malacologist and is renown for his contributions especially on Mediterranean and Sunda Island terrestrial gastropods.
Although, basically, the Impressionists were concerned with the creation of light through colour, several artists identified with them made major contributions to printmaking.
Advertisements for the 2008 Whitney Biennial promise a show that will tell us "where American art stands today," although we basically already know.
But much of the analysis has ignored that many Arab countries, although they basically share the same language and religion, are very different in their history, culture, economy and politics.
Although GQ basically supports growth-decoupled product formation, AQ enables maximum cell-specific peaks of productivity and accelerates growth.
Although we basically adopt ā = 0.1 μm, we also examine ā = 0.01 μm for a quick growth case, later.
Although we basically considered that the plate interface in these subregions was fully ruptured by the mainshock, the coseismic slip possibly did not reach the western end of the deepest subregions; in particular, in subregion 1.
