They are not two separate issues.
You just do not want to confront the issue that abortion of the fetus is the same as a man forcing an unwanted procedure upon a woman.
How would the woman feel if the man took her down to the clinic, put her in a chair, and told the doctor to kill the fetus inside her? But its ok for a woman to kill the fetus?
The issue is not the fetus. The woman has a constitutionally protected right to make medical decisions regarding her own body, fetus included. The fetus is not a US citizen, and is not protected by US law in the same way that the woman is. Therefore, the woman has substantially greater protection from being subject to forcible medical procedures than the fetus does.
Then the same should go for women. If a woman has the right to skirt her responsibilities with an abortion, so should a man have those same rights.
What's strange is that you believe that in order to avoid a man being saddled with a financial obligation against his will you would give him the ability to use the power of the state to force a woman to undergo what can be in a fair number of cases an invasive medical procedure against her will.
If the man has a right to force the woman to undergo unwanted medical procedures, then the woman should have the right to force the man to undergo unwanted medical procedures. No man should be able to refuse a demand by any sexual partner to have a vasectomy performed.
