As for the 1000 kickstart have only seen them with 1.3.
1.3 was the highest official kickstart disk made. It might be possible to move some of the libs from the later roms onto disk, but you'd probably need a hard drive and quite a bit of ram or it would be far too annoying.
It is possible to put a kickstart rom in an a1000, you need an adaptor that plugs into the boot rom sockets which also needs to attach to some address lines on the motherboard.
http://lab.amigalounge.com/A1000_ROM.htmlhttp://www.amigaworld.de/hardware/kickstart-adapter/ It should also be possible to use 256k x 8 bit eproms (27C020), with legs bent up to attach the extra address lines to. If you don't want to get into making a board to route all the wires to a 16 bit kickstart rom. You might need to use something to raise the roms, like an extra socket.
