Advice for division promo dodge

Hello, basically I want an advice here. I am sitting on bronze I and I know what low silver is like. I dont want to go there, not until I improve my MMR so I am not hardstuck silver 4 0 lp wit 13 LP for a win and -25 for a loss, so I decided to steamroll bronze 1 games, that I usually carry easily. Problem is promo. thanks to riot fantastic free win policy I must not win a single promo, so I have to dodge 3 times in a row. Is there any workaround to avoid horrendous waiting times to do that? 5 minute first is ok, 30 minute second too. But third one will be even harshers. Is there time expiration period? Will playing flex for example work? Any other advice? Thanks!
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