In an S365 article about Gdrive testing at Sebring there were a couple of interesting items. First, imsa says DPi's have to be from a mainstream OEM with high volume sales in the US. So G-Drives plan wouldn't work at the moment to make a russian oem DPi. Second, it says Panoz was denied the ability by IMSA to make a DPi on a Ligier.
https://sportscar365.com/lemans/wec/...2019-programs/
Personally, i can't see the advantage for the series to deny entries in this category.