One of my schoolteachers always said:
"The most difficult questions have got the easiest responses. Never think too complicated!"
Therefore I've found a solution to the film-format-problem.
It was very simple. For the left side I've used two chopsticks:
The right side was a little bit more difficult, but I had a similar problem with my Zorki 4, 'cause I lost the take-up spool. At the Zorki I've used a piece of a spool for fax paper. But the fax spool is wider as the original spool, therefore I can only use films with maximal 24 frames.
For the ICA I cut the 120-spool and the fax-paper spool and stuffed the 120- into the fax paper-spool.
Yes, this is the Tichý-Style!