Can you still become a vampire when you have Sanguinare Vampiris but drink a health potion

I'm going to quote from the UESP:

There are many ways to contract the disease, all of them involve encountering hostile vampires and letting them attack you. However, rather than let them hit you in melee, you should keep your distance and only allow them to cast their draining spell as this is the only attack that can impart the disease. To speed up contraction, repeatedly lose and gain sight of the target vampire so the spell is cast multiple times. The check for giving you the disease is passed only when the draining spell hits you, not over sustained action.

So the trick is to fight Vampires and force them to use their Vampiric Drain spell on you. Exploit Line of Sight for maximum casts.

Since you can't use the developer console it might very well be unsolvable, but they might correct it in a new patch.

Few ideas I've got:

• Try to become a vampire, when you are standing in sunlight, all your attributes get permanently (until it is night or you are indoors) decreased, the magnitude depends on which stage you are.

• There is an effect, accessible only by using alchemy, that permanently lowers health. It is not the damage one, but Ravage should do it (if I understand it correctly). Although I don't really know whether the potions you create with both positive and negative effects are classified as potions or poisons.

Both of these effects are reversible and might very well not be of any good, but you can at least try.
I am sorry I couldn't provide anything better.