Adding a little extra estrogen to a combined patch is sanctioned by some specialists - care should be individualised - however as the estrogen then exceeds the dose of progestin licenced to assure endometrial protection, if this is done for any length of time eg a few months, the endometrium should be monitored with a scan periodically.
Unfortunately the fixed low doses in many combination products don't meet the needs of all women, it is simply cheaper to produce and stock than a range, and since the WHI prescribing culture has shifted towards very low doses, which don't achieve the same results as those historically used.
It is however possible to wear more than one of your combi patch, this keeps the E:P ratio the same, but could get expensive.
Alternatively you could use transdermal estrogen alone and take oral norethisterone, which is the same progestin in the patch.