Alternatives of financing such as rent-to-own, etc.

It's more about the attitude "I don't like paying interest."

I can't find this attitude in the original post. There was nowhere the question of free financing. In fact, Sennko himself relativized his attitude that indirect interest as a minor evil would be acceptable:

This way, at least direct involvement with interest can be avoided.

So a fee or a percentage surcharge will certainly be acceptable. (Islam certainly does have credit transactions. And yes, that really means fee instead of interest.)

Actually, Sennko himself relativized his attitude that indirect interest rates would be acceptable as a lesser evil:

So a fee or a percentage surcharge will certainly be fine.

And I cannot read that out.