The risks itself is way way way overblown.
Even if you take it in pill form... Unless
1) You've got a genetic predisposition to produce clotting agents
(very few people have ) In this case, no matter what type of estrogen
the risk remains, but still bio-identical would be better.
2)You take non bio-identical estrogens like
ethinilestradiol which ups the clotting risks (1000 times)
or conjugated estrogens like premarin.
Estradiol Valerate and Estradiol have just about no clotting risk
when used transdermally and by injection, or using gels.
In pill form, if you take it sublingually, the risk is just slightly higher, but still very very low.
In pill form, swalloed, if dosage are not high, the risk remains low.