Since the N900 was based on Linux it is pretty easy for the community to work with what we have. The downside is we haven never had open source hardware driver support from Nokia or the upstream manufacturers, this is why we only can do, and have done, so much in the kernel to backport new security and tech into said old kernel. Nokia has long abandoned this 'burning platform' and actually sold it's rights to build phones to MSFT for something like 5 years, though they are now making android phones. Everything here is all community now.
There is F(x)tec Pro1 X: https://www.fxtec.com/pro1x But if you are used to Apple level support this is not for you 'cause it seems it may be difficult to get any support easily.