I have the TP-Link TL-WR902AC which as 2 radios (2.4G + 5G), and it is well supported by OpenWrt. There are a large number of GL-iNet devices that are also supported (even if the specific one you're looking at is not).
Many of these devices do support simultaneous AP + sta mode operation, so even if you've got just a single radio, it is still possible to do what you want (with two caveats, below). But it's best if you can use a dual radio device.
You'll assign one radio to operate as sta mode and that will be linked with a wan (often setup as "wwan") interface. The new wwan interface will be, in turn, associated with the wan firewall zone.
The other radio will be configured against your lan interface (and lan firewall zone) for all of your local devices. Install a VPN (such as WireGuard) and have it tunnel home... you'll be all set.
Single radio caveats (applies to dual radio devices when using one radio as sta+AP):
- This negatively affects throughput. But that may not be a huge issue if you're using hotel/public wifi where the bandwidth may not be that great to begin with.
- AP+sta mode setups require that the channel be dictated by the sta mode connection. The consequence of this is that the AP mode will not start (at all) if the connection to the upstream SSID cannot be made (such as a stale entry in the wireless file). There is a solution for this: Travelmate