How do you know if it has been upgraded to MSX2, would be an interesting VDP
You cannot do it just by upgrading the VDP. You would need to do MUCH MORE work on it, including ROM (BIOS) changes, even so the LD games would still be all MSX1 (sprites & sound).
Indeed, rklok, did you test StarBlade with this setup? If so, I'm very intersted in all details of it, as it would be a new Palcom game. Does the cover mention Palcom or MSX in any way?