My radio0 has been configured at 160MHz for ages, and I have not detected any issue. But I could not make it work untill I configured all three radios to the same country.
You cannot change the country on radio0 or radio1, but you can change it on radio1 (see the link on my previous post). Portugal and France share the same regulations, so you can change radio2 to France, have all three on the same country, and not break any law.