Thanks for hints guys
The problem on the fabrication side is that the vias have to be so small that they are laser drilled which not all houses have. For larger drilled vias, they have to be filled so that the solder does no wick through and cause assembly problems.
Probably in my case those two shown vias can be larger, since during assembly I'll try to make such trick, that both sides of double layer PCB will be reflowed at the same time
That is why I've designed this PCB in a way that the only part on bottom side is inductor:
This is 12mm x 12mm square shaped inductor
so, while probably it will be maunufactured at home using my custom made PnP,
first top layer will be PnP placed than solder paste added to this square inductor in place where we have pads on bottom side and PCB placed on top of inductor ready to put into reflow oven
I didn't tested it yet, but I think it can work and this way solder will not wick through too much even if I'll have bigger vias hole since gravity will keep solder on the bottom side inductor pads
A little bit tricky-we'll see if it works