The same solution had already been used to develop a Fuji Neopan 400 @ 1600. ...
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Recipes by Dee-Dee-R
Kodak T-Max 400 at 1600 in Kodak T-MAX 1+4
11 minutes at 20°C/68.0°F
Kodak T-Max 400 in Kodak T-MAX 1+4
7 minutes, 30 seconds at 20°C/68.0°F
Kodak T-Max 400 in Kodak T-MAX 1 + 4
8 minutes at 20°C/68.0°F
Foma Fomapan 100 in Agfa R09 One Shot 1 + 50
9 minutes at 20°C/68.0°F
Ilford FP4+ 125 in Agfa R09 One Shot 1+100
1 hour (Stand developed) at 20°C/68.0°F
Rollei Retro 80S in Agfa R09 One Shot 1+100
1 hour (Stand developed) at 20°C/68.0°F
Foma Fomapan 400 in Agfa R09 One Shot 1+100
2 hours at 20°C/68.0°F
7 recipes in total