Planning to insulate my basement. Step one is to decide what to do with the existing windows. There are 4 wood windows at each corner of the north and south side. The 2 on the north side are shown in the pic. They are at grade and have attracted termites in the past. The basement is storage and mechanicals only and is just over 6ft deep with 2ft above grade with the windows. There is a bulkhead entrance for access and any necessary ventilation should it ever be needed. My first thought is to remove them and make it look like they never existed. However, I’m not sure I can find block to match the block as shown in the pic. I thought I read while lurking here that removal is best if they are not needed, but I can’t find what I read. Recommendations?

Thanks