> just a single varchar column doesn't work.

Why not?

Try:

testt7 =: Create__testd 'id7'
InsertCols__testd 'id7'; 0 : 0
ts    varchar
)
Insert__testd 'id7';<<<"1 L:0 (8j0&":) i. 5
Insert__testd 'id7';<<<"1 L:0 (8j0&":) i. 10
Insert__testd 'id7';<<<"1 L:0 (8j0&":) i. 15

   Reads__testd 'from id0'
+-----------------------------------------------------------------------
-------------------------------------------------+
|ts
|
+-----------------------------------------------------------------------
-------------------------------------------------+
|       0       1       2       3       4
|
|       0       1       2       3       4       5       6       7
8       9                                        |
|       0       1       2       3       4       5       6       7
8       9      10      11      12      13      14|
+-----------------------------------------------------------------------
-------------------------------------------------+

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