Is there a cheaper device than an Archer C7 to play with VLAN

Ok, while I am getting closer in understanding how I can setup what I want: See

I need another OpenWRT router as Wireless bridge master for testing. Before I am sure, that everything works what I want, I will not touch the existing system.

What do you think about a MikroTik RB2011UiAS-2HnD-IN as master?

Client for testing will be a TP-Link TL-WR1043ND v1.8

After testing this router makes a little bit sense for me, because it has more than 4 LAN ports.

Alternative is the ZyXEL NBG6817 (Armor Z2) - https://openwrt.org/toh/hwdata/zyxel/zyxel_nbg6817 which is nearly the same as my NetGear Nighthawk X4S (R7800), which I use as master for my running system. The Zyxel has a lot more power than the Mikrotik and it is available for 170€ while the Mikrotik costs about 110€.

Are the problems fixed with 19.07.7?