Update: I spoke with Astroshop but there is no easy solution. They do not have an adapter plate that can take the 80mm diameter focuser and fit it into 70x73mm hole distances on the OTA. Their option is to drill, either self or send it back to them to be drilled. I am not, naturally, too enthusiastic about sending it back for drilling. I am equally unenthusiastic to drill myself, though a simple procedure, due to the risk of scratching the secondary or leave debris damage the primary.
After much thought, I decided to downgrade the focuser to a more std. dual speed, 1:10 Crawford focuser from TS which can take payload upto 2.5Kilograms. This focuser comes without a base, but the diameter description matches the 78mm diameter on the original connector on my Omegon OTA. I am waiting for delivery and will add in a note if there are fitting-problems.
My main aim this year is visual only and I do not plan to load my DSLR on the focuser. My EPs should not exceed the weight threshold. But will share if focus-creep becomes a problem. TS description promises that the locking mechanism prevents this, so I am hopeful though.
Thank you for your advice and sharing your knowledge & wisdom, as always.
Best regards