I would love to do some crosses with anything. All my attempts last year resulted in dropped blossoms. I hope to have better luck this year. Some glasses will help, last year I was trying to cross with potted plants in the garage and though lighting was bad, well it wasn't the light so much as my aging eyes. I don't know how these guys do so many. Maybe better luck this year with better feeding on the plants etc.
I bought a pair of cheap reading glasses with 3 x magnification and a pair of surgical tweezers from Amazon, was a real breakthrough moment for me after trying (and failing) balancing a magnifying glass and 'borrowing' the wife's tweezers! I found the most effective method, especially with c.chinense which can be very fiddly, is to take a pollen sack which is almost ready to open and literally tear it open with the tweezers and dump the contents directly onto the target stigma.