I had similar problem recently. I had ibis business and applied for A+ (though I was/am a plat from my stays). I ended up having 2 separated accounts (Le Club Plat and A+ Silver). I wanted to book with A+ account to gain more discount, but I was concerned about my plat perk as well, so raised the concern to my A+ rep and he suggested booking stays with A+ Silver, then flash the plat card at check in. Maybe that could be done since it was suggested by A+ rep...
However, I have not tried that myself. I do not like breaking rules (that one person could not have ibis biz and A+ at the same time, even though this does not make any sense, but respect it nonetheless) so I canceled my ibis biz (still had half a year before expire) and merged my lcah plat account with A+ so now being A+ plat.
Maybe you could soft try it (a night stay or something) and see how it goes
