As a bhikkhuni, I am very happy you would like to ordain in a bhikkhuni supporting group.
Ordaining into an explicitly pro-bhikkhuni group is hands down the best thing (from my perspective) that potential monks can do to support us. Anything else is basically just consenting to the status quo.
The status quo for Theravada bhikkhunis is an international embarrassment. Many women in Theravada countries now face incredible barriers just to practice their religion as bhikkhunis. Some of these barriers involve access to ID cards, risk of imprisonment or vigilante violence, lack of recognition, access to tax exemptions etc. This is how Theravada Buddhists are currently treating the bhikkhuni sangha. Meanwhile, 3000-5000 Theravada bhikkhunis are surviving all of this through grassroots support to do great things as meditators, scholars and community leaders on only a fraction of the support they should have.
Sometimes due to external constraints, monks may be in systems where they just have to accept the way things are, especially as a junior monk. It’s not their fault. But if you have the choice, I always ask future monks to please consider making a pro-bhikkhuni choice from the outset. Your seniors will live a long time, certain groups in Asia are running hard lines on this issue, you may not be able to help nuns easily in anti-bhikkhuni or pro status quo traditions.
The fact that monks might support on the down low is better than open hostility. Most monks will be happy to give some requisites and kind words. But nobody can live on a pack of tea and good wishes. We need open support for dedicated institutions and structures which support our practice with dignity.
The local bhikkhunis will normally have encyclopedic knowledge of who supports and who doesn’t (and whose actual track record on women doesn’t live up to their public reputation). This is how we survive. You could also just ask the local nuns who they would recommend.
There are many more monks who support bhikkhunis in the West than the ones listed. I would recommend narrowing the field down by country. We have been getting a few “where to ordain” type questions recently, but without knowing your nationality, the scope is too broad.
Support for bhikkhunis as well as spoken English levels are typically higher (but not universal) in Sri Lankan communities in the West than the equivalent Thai or Burmese communities (but there are also Thai and Burmese monks who support). Dharma Vijaya in Los Angeles also comes to mind, where Bhante Piyananda is a long term supporter of bhikkhunis.
Some of the local monk groups may support bhikkhunis, but have unclear records on other issues, or local rather than international reputations. In any case, the large vinaya-based international places with a track record of training candidates are likely to offer the most predictable system. I would also be concerned about getting myself the highest quality monastic education possible under the circumstances. But yes if you can find a bhikkhuni supporting place with good vinaya, please consider it.