Well then we can heavily narrow this down. If we only know of DYRL, M+ and M7 there's nothing left from DYRL they can make. If it's a new Valk never been done before then there isn't anything left in M+ but the VA-3, which could also include the VA-3C from M7. Then there's the VF-14 (also in M+), VF-5000 and some of the enemy Mecha (which seem to be skipped as they don't sell.) There really aren't many options here.
One thing I will say is the most likely to have re-sculpts is the VF-14. VF-14 PLUS version, all of the Varuta versions and the M3 version. VA-3 and VF-5000 are limited.