Law / No availability to apply for Poland's National Visa. Indian national married to Polish. [30]

Hello,

I am an Indian national married to Polish since 2012. We are travelling to Poland for 6 months (sept - march) as my wife is pregnant and we decided to give birth to the baby in Poland where she can be around her family and loved ones.

We booked out tickets for September 1st to Poland and got the invitation from her family just now.

So, I went to the Mumbai Polish consulate website to apply for the national visa & to my surprise it gives an error that there are no dates available till aug31 to apply! I immediately rushed to the Delhi consulate page which says there are no dates till September 29!!

This suddenly got us into a tense situation as we have made all the arrangement.

I quickly applied for Schenghen visa for 90 days and started my crazy google search in Polish! Came across a Polish official document saying that I can apply for "zezwolenie na pobyt czasowy" ( temporarily residency permit) while in Poland, pay a fee of 340 zl which basically can extend my stay for 6 months.

I would like to know if someone on this forum has gone through this procedure and if there is something I can do to get national visa instead of Schenghen visa when I go for the interview?