Just get that 30X40cm RRB easel, they're really nice. The previous posters are correct to say that a large easel may not be ideal for small prints, but if 30X40cm is going to be your largest size, the RRB you talk about will be fine.
Then, as you will be working, printing, etc: over time you will understand your own needs, this too. Just keep an eye on 2nd hand equipment, easels in particular, and the perfect one always turns up. Give it all time !
It is how, over 40 years, I got four or five great easels and use them all, ha
PS: if you can't fix that blade to lay flat, send me a pm